diff --git a/apps/block_scout_web/assets/__tests__/pages/block.js b/apps/block_scout_web/assets/__tests__/pages/block.js
index 0f50e9cf7f..f6f84976fb 100644
--- a/apps/block_scout_web/assets/__tests__/pages/block.js
+++ b/apps/block_scout_web/assets/__tests__/pages/block.js
@@ -1,13 +1,111 @@
 import { reducer, initialState } from '../../js/pages/block'
 
-test('RECEIVED_NEW_BLOCK', () => {
+
+test('CHANNEL_DISCONNECTED', () => {
+  const state = initialState
   const action = {
-    type: 'RECEIVED_NEW_BLOCK',
-    msg: {
-      blockHtml: "test"
-    }
+    type: 'CHANNEL_DISCONNECTED'
   }
-  const output = reducer(initialState, action)
+  const output = reducer(state, action)
+
+  expect(output.channelDisconnected).toBe(true)
+})
+
+describe('RECEIVED_NEW_BLOCK', () => {
+  test('receives new block', () => {
+    const action = {
+      type: 'RECEIVED_NEW_BLOCK',
+      msg: {
+        blockHtml: 'test',
+        blockNumber: 1
+      }
+    }
+    const output = reducer(initialState, action)
+
+    expect(output.newBlock).toBe('test')
+    expect(output.blockNumbers).toEqual([1])
+  })
+  test('on page 2+', () => {
+    const state = Object.assign({}, initialState, {
+      beyondPageOne: true
+    })
+    const action = {
+      type: 'RECEIVED_NEW_BLOCK',
+      msgs: [{
+        blockHtml: 'test'
+      }]
+    }
+    const output = reducer(state, action)
+
+    expect(output.newBlock).toBe(null)
+    expect(output.blockNumbers).toEqual([])
+    expect(output.skippedBlockNumbers).toEqual([])
+  })
+  test('inserts place holders if block received out of order', () => {
+    const state = Object.assign({}, initialState, {
+      blockNumbers: [2]
+    })
+    const action = {
+      type: 'RECEIVED_NEW_BLOCK',
+      msg: {
+        blockHtml: 'test5',
+        blockNumber: 5
+      }
+    }
+    const output = reducer(state, action)
+
+    expect(output.newBlock).toBe('test5')
+    expect(output.blockNumbers).toEqual([5, 4, 3, 2])
+    expect(output.skippedBlockNumbers).toEqual([3, 4])
+  })
+  test('replaces skipped block', () => {
+    const state = Object.assign({}, initialState, {
+      blockNumbers: [5, 4, 3, 2, 1],
+      skippedBlockNumbers: [1, 3, 4]
+    })
+    const action = {
+      type: 'RECEIVED_NEW_BLOCK',
+      msg: {
+        blockHtml: 'test3',
+        blockNumber: 3
+      }
+    }
+    const output = reducer(state, action)
+
+    expect(output.newBlock).toBe('test3')
+    expect(output.blockNumbers).toEqual([5, 4, 3, 2, 1])
+    expect(output.skippedBlockNumbers).toEqual([1, 4])
+  })
+  test('replaces duplicated block', () => {
+    const state = Object.assign({}, initialState, {
+      blockNumbers: [5, 4]
+    })
+    const action = {
+      type: 'RECEIVED_NEW_BLOCK',
+      msg: {
+        blockHtml: 'test5',
+        blockNumber: 5
+      }
+    }
+    const output = reducer(state, action)
+
+    expect(output.newBlock).toBe('test5')
+    expect(output.blockNumbers).toEqual([5, 4])
+  })
+  test('skips if new block height is lower than lowest on page', () => {
+    const state = Object.assign({}, initialState, {
+      blockNumbers: [5, 4, 3, 2]
+    })
+    const action = {
+      type: 'RECEIVED_NEW_BLOCK',
+      msg: {
+        blockHtml: 'test1',
+        blockNumber: 1
+      }
+    }
+    const output = reducer(state, action)
 
-  expect(output.newBlock).toBe("test")
+    expect(output.newBlock).toBe(null)
+    expect(output.blockNumbers).toEqual([5, 4, 3, 2])
+  })
 })
diff --git a/apps/block_scout_web/assets/__tests__/pages/chain.js b/apps/block_scout_web/assets/__tests__/pages/chain.js
index dca639315b..d3bc264f05 100644
--- a/apps/block_scout_web/assets/__tests__/pages/chain.js
+++ b/apps/block_scout_web/assets/__tests__/pages/chain.js
@@ -15,22 +15,140 @@ test('RECEIVED_NEW_ADDRESS_COUNT', () => {
   expect(output.addressCount).toEqual('1,000,000')
 })
 
-test('RECEIVED_NEW_BLOCK', () => {
-  const state = Object.assign({}, initialState, {
-    averageBlockTime: '6 seconds',
-    newBlock: 'last new block'
+describe('RECEIVED_NEW_BLOCK', () => {
+  test('receives new block', () => {
+    const state = Object.assign({}, initialState, {
+      averageBlockTime: '6 seconds',
+      blockNumbers: [1],
+      newBlock: 'last new block'
+    })
+    const action = {
+      type: 'RECEIVED_NEW_BLOCK',
+      msg: {
+        averageBlockTime: '5 seconds',
+        blockNumber: 2,
+        chainBlockHtml: 'new block'
+      }
+    }
+    const output = reducer(state, action)
+
+    expect(output.averageBlockTime).toEqual('5 seconds')
+    expect(output.newBlock).toEqual('new block')
+    expect(output.blockNumbers).toEqual([2, 1])
   })
-  const action = {
-    type: 'RECEIVED_NEW_BLOCK',
-    msg: {
+
+  test('inserts place holders if block received out of order', () => {
+    const state = Object.assign({}, initialState, {
+      blockNumbers: [2]
+    })
+    const action = {
+      type: 'RECEIVED_NEW_BLOCK',
+      msg: {
+        averageBlockTime: '5 seconds',
+        chainBlockHtml: 'test5',
+        blockNumber: 5
+      }
+    }
+    const output = reducer(state, action)
+
+    expect(output.averageBlockTime).toEqual('5 seconds')
+    expect(output.newBlock).toBe('test5')
+    expect(output.blockNumbers).toEqual([5, 4, 3, 2])
+    expect(output.skippedBlockNumbers).toEqual([3, 4])
+  })
+  test('replaces skipped block', () => {
+    const state = Object.assign({}, initialState, {
+      blockNumbers: [4, 3, 2, 1],
+      skippedBlockNumbers: [1, 2, 3]
+    })
+    const action = {
+      type: 'RECEIVED_NEW_BLOCK',
+      msg: {
+        averageBlockTime: '5 seconds',
+        chainBlockHtml: 'test2',
+        blockNumber: 2
+      }
+    }
+    const output = reducer(state, action)
+
+    expect(output.averageBlockTime).toEqual('5 seconds')
+    expect(output.newBlock).toBe('test2')
+    expect(output.blockNumbers).toEqual([4, 3, 2, 1])
+    expect(output.skippedBlockNumbers).toEqual([1, 3])
+  })
+  test('replaces duplicated block', () => {
+    const state = Object.assign({}, initialState, {
+      blockNumbers: [5, 4]
+    })
+    const action = {
+      type: 'RECEIVED_NEW_BLOCK',
+      msg: {
+        averageBlockTime: '5 seconds',
+        chainBlockHtml: 'test5',
+        blockNumber: 5
+      }
+    }
+    const output = reducer(state, action)
+
+    expect(output.averageBlockTime).toEqual('5 seconds')
+    expect(output.newBlock).toBe('test5')
+    expect(output.blockNumbers).toEqual([5, 4])
+  })
+  test('skips if new block height is lower than lowest on page', () => {
+    const state = Object.assign({}, initialState, {
       averageBlockTime: '5 seconds',
-      chainBlockHtml: 'new block'
+      blockNumbers: [5, 4, 3, 2]
+    })
+    const action = {
+      type: 'RECEIVED_NEW_BLOCK',
+      msg: {
+        averageBlockTime: '9 seconds',
+        chainBlockHtml: 'test1',
+        blockNumber: 1
+      }
     }
-  }
-  const output = reducer(state, action)
+    const output = reducer(state, action)
+
+    expect(output.averageBlockTime).toEqual('5 seconds')
+    expect(output.newBlock).toBe(null)
+    expect(output.blockNumbers).toEqual([5, 4, 3, 2])
+  })
+  test('only tracks 4 blocks based on page display limit', () => {
+    const state = Object.assign({}, initialState, {
+      blockNumbers: [5, 4, 3, 2],
+      skippedBlockNumbers: [2, 3, 4]
+    })
+    const action = {
+      type: 'RECEIVED_NEW_BLOCK',
+      msg: {
+        chainBlockHtml: 'test6',
+        blockNumber: 6
+      }
+    }
+    const output = reducer(state, action)
 
-  expect(output.averageBlockTime).toEqual('5 seconds')
-  expect(output.newBlock).toEqual('new block')
+    expect(output.newBlock).toBe('test6')
+    expect(output.blockNumbers).toEqual([6, 5, 4, 3])
+    expect(output.skippedBlockNumbers).toEqual([3, 4])
+  })
+  test('skipped blocks list replaced when another block comes in with +3 blockheight', () => {
+    const state = Object.assign({}, initialState, {
+      blockNumbers: [5, 4, 3, 2],
+      skippedBlockNumbers: [2, 3, 4]
+    })
+    const action = {
+      type: 'RECEIVED_NEW_BLOCK',
+      msg: {
+        chainBlockHtml: 'test10',
+        blockNumber: 10
+      }
+    }
+    const output = reducer(state, action)
+
+    expect(output.newBlock).toBe('test10')
+    expect(output.blockNumbers).toEqual([10, 9, 8, 7])
+    expect(output.skippedBlockNumbers).toEqual([7, 8, 9])
+  })
 })
 
 test('RECEIVED_NEW_EXCHANGE_RATE', () => {
diff --git a/apps/block_scout_web/assets/__tests__/pages/transaction.js b/apps/block_scout_web/assets/__tests__/pages/transaction.js
index b4ba0f62b7..ea4eb3595f 100644
--- a/apps/block_scout_web/assets/__tests__/pages/transaction.js
+++ b/apps/block_scout_web/assets/__tests__/pages/transaction.js
@@ -1,5 +1,16 @@
 import { reducer, initialState } from '../../js/pages/transaction'
 
+test('CHANNEL_DISCONNECTED', () => {
+  const state = initialState
+  const action = {
+    type: 'CHANNEL_DISCONNECTED'
+  }
+  const output = reducer(state, action)
+
+  expect(output.channelDisconnected).toBe(true)
+  expect(output.batchCountAccumulator).toBe(0)
+})
+
 test('RECEIVED_NEW_BLOCK', () => {
   const state = { ...initialState, blockNumber: 1 }
   const action = {
diff --git a/apps/block_scout_web/assets/css/components/_animations.scss b/apps/block_scout_web/assets/css/components/_animations.scss
index 8318de83dc..b8fb3d1db4 100644
--- a/apps/block_scout_web/assets/css/components/_animations.scss
+++ b/apps/block_scout_web/assets/css/components/_animations.scss
@@ -8,20 +8,11 @@
   0% {
     flex-basis: 0%;
     width: 0%;
-    opacity: 0;
-  }
-  25% {
-    opacity: 0;
-    transform: translateY(10px) scale(0.97);
   }
   50% {
     flex-basis: 25%;
     width: 25%;
   }
-  100% {
-    opacity: 1;
-    transform: translateY(0) scale(1);
-  }
 }
 
 @keyframes fade-up {
@@ -34,25 +25,7 @@
     transform: translateY(10px) scale(0.97);
   }
   50% {
-    height: 98px;
-  }
-  100% {
-    opacity: 1;
-    transform: translateY(0) scale(1);
-  }
-}
-
-@keyframes fade-up--mobile {
-  0% {
-    height: 0;
-    opacity: 0;
-  }
-  25% {
-    opacity: 0;
-    transform: translateY(10px) scale(0.97);
-  }
-  50% {
-    height: 202px;
+    height: 100px;
   }
   100% {
     opacity: 1;
@@ -67,7 +40,7 @@
   }
   100% {
     opacity: 0;
-    transform: scale(0.5);
+    transform: scale(0.75);
   }
 }
 
@@ -80,22 +53,17 @@
   max-height: 98px;
   animation: fade-up-blocks-chain 0.6s cubic-bezier(0.455, 0.03, 0.515, 0.955);
 
-  @media (max-width: 767px) {
-    animation: fade-up--mobile 0.6s cubic-bezier(0.455, 0.03, 0.515, 0.955);
+  @include media-breakpoint-down(md) {
+    animation: none;
   }
 }
 
 .fade-up {
   will-change: transform, opacity, height;
-  max-height: 98px;
   animation: fade-up 0.6s cubic-bezier(0.455, 0.03, 0.515, 0.955);
-
-  @media (max-width: 767px) {
-    max-height: 202px;
-    animation: fade-up--mobile 0.6s cubic-bezier(0.455, 0.03, 0.515, 0.955);
-  }
 }
 
 .shrink-out {
-  animation: shrink-out 0.45s cubic-bezier(0.55, 0.055, 0.675, 0.19) forwards;
+  transform-origin: bottom center;
+  animation: shrink-out 0.3s cubic-bezier(0.55, 0.055, 0.675, 0.19) forwards;
 }
diff --git a/apps/block_scout_web/assets/css/components/_card.scss b/apps/block_scout_web/assets/css/components/_card.scss
index 13f7cf925c..d34f461fa7 100644
--- a/apps/block_scout_web/assets/css/components/_card.scss
+++ b/apps/block_scout_web/assets/css/components/_card.scss
@@ -34,5 +34,5 @@
 .card-chain-blocks {
   height: auto;
 
-  @media (max-width: 767px) { height: 595px; }
+  @include media-breakpoint-down(md) { height: 595px; }
 }
diff --git a/apps/block_scout_web/assets/css/components/_loading-spinner.scss b/apps/block_scout_web/assets/css/components/_loading-spinner.scss
index 9ea746441a..a4b02051e6 100644
--- a/apps/block_scout_web/assets/css/components/_loading-spinner.scss
+++ b/apps/block_scout_web/assets/css/components/_loading-spinner.scss
@@ -1,3 +1,10 @@
+// ATTRIBUTION
+//
+// Author: Tobias Ahlin (tobiasahlin)
+//
+// SpinKit - Simple loading spinners animated with CSS.
+// https://github.com/tobiasahlin/SpinKit
+
 .loading-spinner {
   margin: auto 1rem;
   width: 40px;
@@ -38,7 +45,7 @@
 .loading-spinner-small {
   display: inline-block;
   position: relative;
-  top: -0.05em;
+  top: -0.125em;
   margin: auto 0.5em auto 0;
   width: 1em;
   height: 1em;
diff --git a/apps/block_scout_web/assets/js/pages/block.js b/apps/block_scout_web/assets/js/pages/block.js
index 17cf0eec5a..1ff04f7225 100644
--- a/apps/block_scout_web/assets/js/pages/block.js
+++ b/apps/block_scout_web/assets/js/pages/block.js
@@ -1,4 +1,5 @@
 import $ from 'jquery'
+import _ from 'lodash'
 import URI from 'urijs'
 import humps from 'humps'
 import socket from '../socket'
@@ -6,16 +7,20 @@ import { updateAllAges } from '../lib/from_now'
 import { initRedux, prependWithClingBottom } from '../utils'
 
 export const initialState = {
+  blockNumbers: [],
   beyondPageOne: null,
   channelDisconnected: false,
-  newBlock: null
+  newBlock: null,
+  replaceBlock: null,
+  skippedBlockNumbers: []
 }
 
 export function reducer (state = initialState, action) {
   switch (action.type) {
     case 'PAGE_LOAD': {
       return Object.assign({}, state, {
-        beyondPageOne: action.beyondPageOne
+        beyondPageOne: action.beyondPageOne,
+        blockNumbers: action.blockNumbers
       })
     }
     case 'CHANNEL_DISCONNECTED': {
@@ -24,11 +29,36 @@ export function reducer (state = initialState, action) {
       })
     }
     case 'RECEIVED_NEW_BLOCK': {
-      if (state.channelDisconnected) return state
+      if (state.channelDisconnected || state.beyondPageOne) return state
 
-      return Object.assign({}, state, {
-        newBlock: action.msg.blockHtml
-      })
+      const blockNumber = parseInt(action.msg.blockNumber)
+      if (_.includes(state.blockNumbers, blockNumber)) {
+        return Object.assign({}, state, {
+          newBlock: action.msg.blockHtml,
+          replaceBlock: blockNumber,
+          skippedBlockNumbers: _.without(state.skippedBlockNumbers, blockNumber)
+        })
+      } else if (blockNumber < _.last(state.blockNumbers)) {
+        return state
+      } else {
+        let skippedBlockNumbers = state.skippedBlockNumbers.slice(0)
+        if (blockNumber > state.blockNumbers[0] + 1) {
+          for (let i = state.blockNumbers[0] + 1; i < blockNumber; i++) {
+            skippedBlockNumbers.push(i)
+          }
+        }
+        const newBlockNumbers = _.chain([blockNumber])
+          .union(skippedBlockNumbers, state.blockNumbers)
+          .orderBy([], ['desc'])
+          .value()
+
+        return Object.assign({}, state, {
+          blockNumbers: newBlockNumbers,
+          newBlock: action.msg.blockHtml,
+          replaceBlock: null,
+          skippedBlockNumbers
+        })
+      }
     }
     default:
       return state
@@ -41,7 +71,8 @@ if ($blockListPage.length) {
     main (store) {
       const state = store.dispatch({
         type: 'PAGE_LOAD',
-        beyondPageOne: !!humps.camelizeKeys(URI(window.location).query(true)).blockNumber
+        beyondPageOne: !!humps.camelizeKeys(URI(window.location).query(true)).blockNumber,
+        blockNumbers: $('[data-selector="block-number"]').map((index, el) => parseInt(el.innerText)).toArray()
       })
       if (!state.beyondPageOne) {
         const blocksChannel = socket.channel(`blocks:new_block`, {})
@@ -57,10 +88,44 @@ if ($blockListPage.length) {
       const $blocksList = $('[data-selector="blocks-list"]')
 
       if (state.channelDisconnected) $channelDisconnected.show()
-      if (oldState.newBlock !== state.newBlock) {
-        prependWithClingBottom($blocksList, state.newBlock)
+      if (oldState.newBlock !== state.newBlock || (state.replaceBlock && oldState.replaceBlock !== state.replaceBlock)) {
+        if (state.replaceBlock && oldState.replaceBlock !== state.replaceBlock) {
+          const $replaceBlock = $(`[data-block-number="${state.replaceBlock}"]`)
+          $replaceBlock.addClass('shrink-out')
+          setTimeout(() => $replaceBlock.replaceWith(state.newBlock), 400)
+        } else {
+          if (oldState.skippedBlockNumbers !== state.skippedBlockNumbers) {
+            const newSkippedBlockNumbers = _.difference(state.skippedBlockNumbers, oldState.skippedBlockNumbers)
+            _.map(newSkippedBlockNumbers, (skippedBlockNumber) => {
+              prependWithClingBottom($blocksList, placeHolderBlock(skippedBlockNumber))
+            })
+          }
+          prependWithClingBottom($blocksList, state.newBlock)
+        }
         updateAllAges()
       }
     }
   })
 }
+
+function placeHolderBlock (blockNumber) {
+  return `
+    <div class="my-3" style="height: 98px;">
+      <div
+        class="tile tile-type-block d-flex align-items-center fade-up"
+        data-selector="place-holder"
+        data-block-number="${blockNumber}"
+        style="height: 98px;"
+      >
+        <span class="loading-spinner-small ml-1 mr-4">
+          <span class="loading-spinner-block-1"></span>
+          <span class="loading-spinner-block-2"></span>
+        </span>
+        <div>
+          <div class="tile-title">${blockNumber}</div>
+          <div>${window.localized['Block Processing']}</div>
+        </div>
+      </div>
+    </div>
+  `
+}
diff --git a/apps/block_scout_web/assets/js/pages/chain.js b/apps/block_scout_web/assets/js/pages/chain.js
index 08ed8fe023..90ff02ae38 100644
--- a/apps/block_scout_web/assets/js/pages/chain.js
+++ b/apps/block_scout_web/assets/js/pages/chain.js
@@ -1,4 +1,5 @@
 import $ from 'jquery'
+import _ from 'lodash'
 import humps from 'humps'
 import numeral from 'numeral'
 import socket from '../socket'
@@ -14,9 +15,12 @@ export const initialState = {
   availableSupply: null,
   averageBlockTime: null,
   batchCountAccumulator: 0,
+  blockNumbers: [],
   marketHistoryData: null,
   newBlock: null,
   newTransactions: [],
+  replaceBlock: null,
+  skippedBlockNumbers: [],
   transactionCount: null,
   usdMarketCap: null
 }
@@ -25,6 +29,7 @@ export function reducer (state = initialState, action) {
   switch (action.type) {
     case 'PAGE_LOAD': {
       return Object.assign({}, state, {
+        blockNumbers: action.blockNumbers,
         transactionCount: numeral(action.transactionCount).value()
       })
     }
@@ -34,10 +39,43 @@ export function reducer (state = initialState, action) {
       })
     }
     case 'RECEIVED_NEW_BLOCK': {
-      return Object.assign({}, state, {
-        averageBlockTime: action.msg.averageBlockTime,
-        newBlock: action.msg.chainBlockHtml
-      })
+      const blockNumber = parseInt(action.msg.blockNumber)
+      if (_.includes(state.blockNumbers, blockNumber)) {
+        return Object.assign({}, state, {
+          averageBlockTime: action.msg.averageBlockTime,
+          newBlock: action.msg.chainBlockHtml,
+          replaceBlock: blockNumber,
+          skippedBlockNumbers: _.without(state.skippedBlockNumbers, blockNumber)
+        })
+      } else if (blockNumber < _.last(state.blockNumbers)) {
+        return Object.assign({}, state, { newBlock: null })
+      } else {
+        let skippedBlockNumbers = state.skippedBlockNumbers.slice(0)
+        if (blockNumber > state.blockNumbers[0] + 1) {
+          let lastPlaceholder = state.blockNumbers[0] + 1
+          if (blockNumber - lastPlaceholder > 3) {
+            lastPlaceholder = blockNumber - 3
+            skippedBlockNumbers = []
+          }
+          for (let i = lastPlaceholder; i < blockNumber; i++) {
+            skippedBlockNumbers.push(i)
+          }
+        }
+        const newBlockNumbers = _.chain([blockNumber])
+          .union(skippedBlockNumbers, state.blockNumbers)
+          .orderBy([], ['desc'])
+          .slice(0, 4)
+          .value()
+
+        const newSkippedBlockNumbers = _.intersection(skippedBlockNumbers, newBlockNumbers)
+        return Object.assign({}, state, {
+          averageBlockTime: action.msg.averageBlockTime,
+          blockNumbers: newBlockNumbers,
+          newBlock: action.msg.chainBlockHtml,
+          replaceBlock: null,
+          skippedBlockNumbers: newSkippedBlockNumbers
+        })
+      }
     }
     case 'RECEIVED_NEW_EXCHANGE_RATE': {
       return Object.assign({}, state, {
@@ -79,6 +117,7 @@ if ($chainDetailsPage.length) {
       const blocksChannel = socket.channel(`blocks:new_block`)
       store.dispatch({
         type: 'PAGE_LOAD',
+        blockNumbers: $('[data-selector="block-number"]').map((index, el) => parseInt(el.innerText)).toArray(),
         transactionCount: $('[data-selector="transaction-count"]').text()
       })
       blocksChannel.join()
@@ -113,9 +152,25 @@ if ($chainDetailsPage.length) {
       if (oldState.usdMarketCap !== state.usdMarketCap) {
         $marketCap.empty().append(formatUsdValue(state.usdMarketCap))
       }
-      if (oldState.newBlock !== state.newBlock) {
-        $blockList.children().last().remove()
-        $blockList.prepend(state.newBlock)
+      if (state.newBlock && oldState.newBlock !== state.newBlock) {
+        if (state.replaceBlock && oldState.replaceBlock !== state.replaceBlock) {
+          const $replaceBlock = $(`[data-block-number="${state.replaceBlock}"]`)
+          $replaceBlock.addClass('shrink-out')
+          setTimeout(() => $replaceBlock.replaceWith(state.newBlock), 400)
+        } else {
+          if (oldState.skippedBlockNumbers !== state.skippedBlockNumbers) {
+            const newSkippedBlockNumbers = _.chain(state.skippedBlockNumbers)
+              .difference(oldState.skippedBlockNumbers)
+              .intersection(state.blockNumbers)
+              .value()
+            _.map(newSkippedBlockNumbers, (skippedBlockNumber) => {
+              $blockList.children().last().remove()
+              $blockList.prepend(placeHolderBlock(skippedBlockNumber))
+            })
+          }
+          $blockList.children().last().remove()
+          $blockList.prepend(newBlockHtml(state.newBlock))
+        }
         updateAllAges()
       }
       if (oldState.transactionCount !== state.transactionCount) $transactionCount.empty().append(numeral(state.transactionCount).format())
@@ -142,3 +197,36 @@ if ($chainDetailsPage.length) {
     }
   })
 }
+
+function newBlockHtml (blockHtml) {
+  return `
+    <div class="col-lg-3 fade-up-blocks-chain mb-3 mb-lg-0">
+      ${blockHtml}
+    </div>
+  `
+}
+
+function placeHolderBlock (blockNumber) {
+  return `
+    <div
+      class="col-lg-3 fade-up-blocks-chain mb-3 mb-lg-0"
+      style="min-height: 98px;"
+    >
+      <div
+        class="tile tile-type-block d-flex align-items-center fade-up"
+        data-selector="place-holder"
+        data-block-number="${blockNumber}"
+        style="height: 98px;"
+      >
+        <span class="loading-spinner-small ml-1 mr-4">
+          <span class="loading-spinner-block-1"></span>
+          <span class="loading-spinner-block-2"></span>
+        </span>
+        <div>
+          <div class="tile-title">${blockNumber}</div>
+          <div>${window.localized['Block Processing']}</div>
+        </div>
+      </div>
+    </div>
+  `
+}
diff --git a/apps/block_scout_web/lib/block_scout_web/templates/block/_tile.html.eex b/apps/block_scout_web/lib/block_scout_web/templates/block/_tile.html.eex
index 302490c464..e34ce63418 100644
--- a/apps/block_scout_web/lib/block_scout_web/templates/block/_tile.html.eex
+++ b/apps/block_scout_web/lib/block_scout_web/templates/block/_tile.html.eex
@@ -1,4 +1,4 @@
-<div class="tile tile-type-block fade-up">
+<div class="tile tile-type-block fade-up" data-block-number="<%= to_string(@block.number) %>">
   <div class="row">
     <div class="col-md-8 col-lg-9">
       <!-- block height -->
@@ -6,8 +6,7 @@
             @block,
             class: "tile-title",
             to: block_path(BlockScoutWeb.Endpoint, :show, @block),
-            "data-test": "block_number",
-            "data-block-number": to_string(@block.number)
+            "data-selector": "block-number"
           ) %>
       <div>
         <!-- transactions -->
diff --git a/apps/block_scout_web/lib/block_scout_web/templates/chain/_block.html.eex b/apps/block_scout_web/lib/block_scout_web/templates/chain/_block.html.eex
index 2811534741..cfcce5f33e 100644
--- a/apps/block_scout_web/lib/block_scout_web/templates/chain/_block.html.eex
+++ b/apps/block_scout_web/lib/block_scout_web/templates/chain/_block.html.eex
@@ -1,17 +1,20 @@
-<div class="col-sm-3 fade-up-blocks-chain mb-3 mb-sm-0" data-selector="chain-block" data-block-number="<%= @block.number %>">
-  <div class="tile tile-type-block d-flex flex-column">
-    <%= link(@block, to: block_path(BlockScoutWeb.Endpoint, :show, @block), class: "tile-title") %>
-    <div>
-      <span class="mr-2"> <%= Enum.count(@block.transactions) %> Transactions </span>
-      <span class="text-nowrap" data-from-now="<%= @block.timestamp %>"> </span>
-    </div>
-    <span class="text-truncate">
-      <%= gettext "Miner" %>
-
-      <%= render BlockScoutWeb.AddressView,
-        "_link.html",
-        address: @block.miner,
-        contract: false %>
-    </span>
+<div class="tile tile-type-block d-flex flex-column" data-selector="chain-block" data-block-number="<%= @block.number %>">
+  <%= link(
+        @block,
+        class: "tile-title",
+        to: block_path(BlockScoutWeb.Endpoint, :show, @block),
+        "data-selector": "block-number"
+      ) %>
+  <div>
+    <span class="mr-2"> <%= gettext("%{count} Transactions", count: Enum.count(@block.transactions)) %> </span>
+    <span class="text-nowrap" data-from-now="<%= @block.timestamp %>"> </span>
   </div>
+  <span class="text-truncate">
+    <%= gettext "Miner" %>
+
+    <%= render BlockScoutWeb.AddressView,
+      "_link.html",
+      address: @block.miner,
+      contract: false %>
+  </span>
 </div>
diff --git a/apps/block_scout_web/lib/block_scout_web/templates/chain/show.html.eex b/apps/block_scout_web/lib/block_scout_web/templates/chain/show.html.eex
index 657ae52887..9516018d5a 100644
--- a/apps/block_scout_web/lib/block_scout_web/templates/chain/show.html.eex
+++ b/apps/block_scout_web/lib/block_scout_web/templates/chain/show.html.eex
@@ -56,7 +56,9 @@
       <h2 class="card-title"><%= gettext "Blocks" %></h2>
       <div class="row" data-selector="chain-block-list">
         <%= for block <- @blocks do %>
-          <%= render BlockScoutWeb.ChainView, "_block.html", block: block %>
+          <div class="col-lg-3 fade-up-blocks-chain mb-3 mb-lg-0">
+            <%= render BlockScoutWeb.ChainView, "_block.html", block: block %>
+          </div>
         <% end %>
       </div>
     </div>
diff --git a/apps/block_scout_web/lib/block_scout_web/templates/layout/app.html.eex b/apps/block_scout_web/lib/block_scout_web/templates/layout/app.html.eex
index 6c014469e4..7bebc9bb48 100644
--- a/apps/block_scout_web/lib/block_scout_web/templates/layout/app.html.eex
+++ b/apps/block_scout_web/lib/block_scout_web/templates/layout/app.html.eex
@@ -30,6 +30,7 @@
     </div>
     <script>
       window.localized = {
+        'Block Processing': '<%= gettext("Block Mined, awaiting processing...") %>',
         'Less than': '<%= gettext("Less than") %>',
         'Market Cap': '<%= gettext("Market Cap") %>',
         'Price': '<%= gettext("Price") %>',
diff --git a/apps/block_scout_web/priv/gettext/default.pot b/apps/block_scout_web/priv/gettext/default.pot
index 9104f93fa7..3ecc28f293 100644
--- a/apps/block_scout_web/priv/gettext/default.pot
+++ b/apps/block_scout_web/priv/gettext/default.pot
@@ -6,7 +6,7 @@ msgstr[0] ""
 msgstr[1] ""
 
 #, elixir-format
-#: lib/block_scout_web/templates/block/_tile.html.eex:15
+#: lib/block_scout_web/templates/block/_tile.html.eex:14
 msgid "%{count} transaction"
 msgid_plural "%{count} transactions"
 msgstr[0] ""
@@ -21,6 +21,7 @@ msgstr[1] ""
 
 #, elixir-format
 #: lib/block_scout_web/templates/block/overview.html.eex:12
+#: lib/block_scout_web/templates/chain/_block.html.eex:9
 msgid "%{count} Transactions"
 msgstr ""
 
@@ -380,13 +381,13 @@ msgid "Gas"
 msgstr ""
 
 #, elixir-format
-#: lib/block_scout_web/templates/block/_tile.html.eex:35
+#: lib/block_scout_web/templates/block/_tile.html.eex:34
 #: lib/block_scout_web/templates/block/overview.html.eex:97
 msgid "Gas Limit"
 msgstr ""
 
 #, elixir-format
-#: lib/block_scout_web/templates/block/_tile.html.eex:40
+#: lib/block_scout_web/templates/block/_tile.html.eex:39
 #: lib/block_scout_web/templates/block/overview.html.eex:89
 msgid "Gas Used"
 msgstr ""
@@ -446,7 +447,7 @@ msgid "Inventory"
 msgstr ""
 
 #, elixir-format
-#: lib/block_scout_web/templates/layout/app.html.eex:33
+#: lib/block_scout_web/templates/layout/app.html.eex:34
 msgid "Less than"
 msgstr ""
 
@@ -465,7 +466,7 @@ msgstr ""
 
 #, elixir-format
 #: lib/block_scout_web/templates/chain/show.html.eex:17
-#: lib/block_scout_web/templates/layout/app.html.eex:34
+#: lib/block_scout_web/templates/layout/app.html.eex:35
 #: lib/block_scout_web/views/address_view.ex:101
 msgid "Market Cap"
 msgstr ""
@@ -476,9 +477,9 @@ msgid "Max of"
 msgstr ""
 
 #, elixir-format
-#: lib/block_scout_web/templates/block/_tile.html.eex:24
+#: lib/block_scout_web/templates/block/_tile.html.eex:23
 #: lib/block_scout_web/templates/block/overview.html.eex:70
-#: lib/block_scout_web/templates/chain/_block.html.eex:9
+#: lib/block_scout_web/templates/chain/_block.html.eex:13
 msgid "Miner"
 msgstr ""
 
@@ -499,7 +500,7 @@ msgstr ""
 
 #, elixir-format
 #: lib/block_scout_web/templates/address_transaction/index.html.eex:19
-#: lib/block_scout_web/templates/chain/show.html.eex:69
+#: lib/block_scout_web/templates/chain/show.html.eex:71
 #: lib/block_scout_web/templates/pending_transaction/index.html.eex:48
 #: lib/block_scout_web/templates/transaction/index.html.eex:48
 msgid "More transactions have come in"
@@ -624,7 +625,7 @@ msgstr ""
 
 #, elixir-format
 #: lib/block_scout_web/templates/chain/show.html.eex:10
-#: lib/block_scout_web/templates/layout/app.html.eex:35
+#: lib/block_scout_web/templates/layout/app.html.eex:36
 msgid "Price"
 msgstr ""
 
@@ -895,7 +896,7 @@ msgstr ""
 #: lib/block_scout_web/templates/block_transaction/index.html.eex:23
 #: lib/block_scout_web/templates/block_transaction/index.html.eex:26
 #: lib/block_scout_web/templates/block_transaction/index.html.eex:35
-#: lib/block_scout_web/templates/chain/show.html.eex:73
+#: lib/block_scout_web/templates/chain/show.html.eex:75
 #: lib/block_scout_web/templates/layout/_topnav.html.eex:24
 #: lib/block_scout_web/templates/pending_transaction/index.html.eex:56
 #: lib/block_scout_web/templates/transaction/index.html.eex:56
@@ -963,7 +964,7 @@ msgid "View All Blocks →"
 msgstr ""
 
 #, elixir-format
-#: lib/block_scout_web/templates/chain/show.html.eex:72
+#: lib/block_scout_web/templates/chain/show.html.eex:74
 msgid "View All Transactions →"
 msgstr ""
 
@@ -1070,3 +1071,8 @@ msgstr ""
 #: lib/block_scout_web/views/layout_view.ex:21
 msgid "%{subnetwork} %{network} Explorer"
 msgstr ""
+
+#, elixir-format
+#: lib/block_scout_web/templates/layout/app.html.eex:33
+msgid "Block Mined, awaiting processing..."
+msgstr ""
diff --git a/apps/block_scout_web/priv/gettext/en/LC_MESSAGES/default.po b/apps/block_scout_web/priv/gettext/en/LC_MESSAGES/default.po
index a989d61a5d..a5ed338408 100644
--- a/apps/block_scout_web/priv/gettext/en/LC_MESSAGES/default.po
+++ b/apps/block_scout_web/priv/gettext/en/LC_MESSAGES/default.po
@@ -6,7 +6,7 @@ msgstr[0] ""
 msgstr[1] ""
 
 #, elixir-format
-#: lib/block_scout_web/templates/block/_tile.html.eex:15
+#: lib/block_scout_web/templates/block/_tile.html.eex:14
 msgid "%{count} transaction"
 msgid_plural "%{count} transactions"
 msgstr[0] ""
@@ -21,6 +21,7 @@ msgstr[1] ""
 
 #, elixir-format
 #: lib/block_scout_web/templates/block/overview.html.eex:12
+#: lib/block_scout_web/templates/chain/_block.html.eex:9
 msgid "%{count} Transactions"
 msgstr ""
 
@@ -380,13 +381,13 @@ msgid "Gas"
 msgstr ""
 
 #, elixir-format
-#: lib/block_scout_web/templates/block/_tile.html.eex:35
+#: lib/block_scout_web/templates/block/_tile.html.eex:34
 #: lib/block_scout_web/templates/block/overview.html.eex:97
 msgid "Gas Limit"
 msgstr ""
 
 #, elixir-format
-#: lib/block_scout_web/templates/block/_tile.html.eex:40
+#: lib/block_scout_web/templates/block/_tile.html.eex:39
 #: lib/block_scout_web/templates/block/overview.html.eex:89
 msgid "Gas Used"
 msgstr ""
@@ -446,7 +447,7 @@ msgid "Inventory"
 msgstr ""
 
 #, elixir-format
-#: lib/block_scout_web/templates/layout/app.html.eex:33
+#: lib/block_scout_web/templates/layout/app.html.eex:34
 msgid "Less than"
 msgstr ""
 
@@ -465,7 +466,7 @@ msgstr ""
 
 #, elixir-format
 #: lib/block_scout_web/templates/chain/show.html.eex:17
-#: lib/block_scout_web/templates/layout/app.html.eex:34
+#: lib/block_scout_web/templates/layout/app.html.eex:35
 #: lib/block_scout_web/views/address_view.ex:101
 msgid "Market Cap"
 msgstr ""
@@ -476,9 +477,9 @@ msgid "Max of"
 msgstr ""
 
 #, elixir-format
-#: lib/block_scout_web/templates/block/_tile.html.eex:24
+#: lib/block_scout_web/templates/block/_tile.html.eex:23
 #: lib/block_scout_web/templates/block/overview.html.eex:70
-#: lib/block_scout_web/templates/chain/_block.html.eex:9
+#: lib/block_scout_web/templates/chain/_block.html.eex:13
 msgid "Miner"
 msgstr ""
 
@@ -499,7 +500,7 @@ msgstr ""
 
 #, elixir-format
 #: lib/block_scout_web/templates/address_transaction/index.html.eex:19
-#: lib/block_scout_web/templates/chain/show.html.eex:69
+#: lib/block_scout_web/templates/chain/show.html.eex:71
 #: lib/block_scout_web/templates/pending_transaction/index.html.eex:48
 #: lib/block_scout_web/templates/transaction/index.html.eex:48
 msgid "More transactions have come in"
@@ -624,7 +625,7 @@ msgstr ""
 
 #, elixir-format
 #: lib/block_scout_web/templates/chain/show.html.eex:10
-#: lib/block_scout_web/templates/layout/app.html.eex:35
+#: lib/block_scout_web/templates/layout/app.html.eex:36
 msgid "Price"
 msgstr ""
 
@@ -895,7 +896,7 @@ msgstr ""
 #: lib/block_scout_web/templates/block_transaction/index.html.eex:23
 #: lib/block_scout_web/templates/block_transaction/index.html.eex:26
 #: lib/block_scout_web/templates/block_transaction/index.html.eex:35
-#: lib/block_scout_web/templates/chain/show.html.eex:73
+#: lib/block_scout_web/templates/chain/show.html.eex:75
 #: lib/block_scout_web/templates/layout/_topnav.html.eex:24
 #: lib/block_scout_web/templates/pending_transaction/index.html.eex:56
 #: lib/block_scout_web/templates/transaction/index.html.eex:56
@@ -963,7 +964,7 @@ msgid "View All Blocks →"
 msgstr ""
 
 #, elixir-format
-#: lib/block_scout_web/templates/chain/show.html.eex:72
+#: lib/block_scout_web/templates/chain/show.html.eex:74
 msgid "View All Transactions →"
 msgstr ""
 
@@ -1070,3 +1071,8 @@ msgstr ""
 #: lib/block_scout_web/views/layout_view.ex:21
 msgid "%{subnetwork} %{network} Explorer"
 msgstr ""
+
+#, elixir-format
+#: lib/block_scout_web/templates/layout/app.html.eex:33
+msgid "Block Mined, awaiting processing..."
+msgstr ""
diff --git a/apps/block_scout_web/test/block_scout_web/features/pages/block_list_page.ex b/apps/block_scout_web/test/block_scout_web/features/pages/block_list_page.ex
index 6b87654b3e..68c1ae9cad 100644
--- a/apps/block_scout_web/test/block_scout_web/features/pages/block_list_page.ex
+++ b/apps/block_scout_web/test/block_scout_web/features/pages/block_list_page.ex
@@ -3,7 +3,7 @@ defmodule BlockScoutWeb.BlockListPage do
 
   use Wallaby.DSL
 
-  import Wallaby.Query, only: [css: 1]
+  import Wallaby.Query, only: [css: 1, css: 2]
 
   alias Explorer.Chain.Block
 
@@ -12,6 +12,10 @@ defmodule BlockScoutWeb.BlockListPage do
   end
 
   def block(%Block{number: block_number}) do
-    css("[data-test='block_number'][data-block-number='#{block_number}']")
+    css("[data-block-number='#{block_number}']")
+  end
+
+  def place_holder_blocks(count) do
+    css("[data-selector='place-holder']", count: count)
   end
 end
diff --git a/apps/block_scout_web/test/block_scout_web/features/viewing_blocks_test.exs b/apps/block_scout_web/test/block_scout_web/features/viewing_blocks_test.exs
index 274a79298a..34ff36128e 100644
--- a/apps/block_scout_web/test/block_scout_web/features/viewing_blocks_test.exs
+++ b/apps/block_scout_web/test/block_scout_web/features/viewing_blocks_test.exs
@@ -1,7 +1,7 @@
 defmodule BlockScoutWeb.ViewingBlocksTest do
   use BlockScoutWeb.FeatureCase, async: true
 
-  alias BlockScoutWeb.{BlockListPage, BlockPage}
+  alias BlockScoutWeb.{BlockListPage, BlockPage, Notifier}
 
   setup do
     timestamp = Timex.now() |> Timex.shift(hours: -1)
@@ -35,6 +35,35 @@ defmodule BlockScoutWeb.ViewingBlocksTest do
       |> assert_has(BlockPage.detail_number(block))
     end
 
+    test "inserts place holder blocks if out of order block received", %{session: session} do
+      BlockListPage.visit_page(session)
+
+      block = insert(:block, number: 315)
+      Notifier.handle_event({:chain_event, :blocks, [block]})
+
+      session
+      |> assert_has(BlockListPage.block(block))
+      |> assert_has(BlockListPage.place_holder_blocks(3))
+    end
+
+    test "replaces place holder block if skipped block received", %{session: session} do
+      BlockListPage.visit_page(session)
+
+      block = insert(:block, number: 315)
+      Notifier.handle_event({:chain_event, :blocks, [block]})
+
+      session
+      |> assert_has(BlockListPage.block(block))
+      |> assert_has(BlockListPage.place_holder_blocks(3))
+
+      skipped_block = insert(:block, number: 314)
+      Notifier.handle_event({:chain_event, :blocks, [skipped_block]})
+
+      session
+      |> assert_has(BlockListPage.block(skipped_block))
+      |> assert_has(BlockListPage.place_holder_blocks(2))
+    end
+
     test "block detail page has transactions", %{session: session} do
       block = insert(:block, number: 42)