diff --git a/packages/app-explorer/src/NodeInfo/Peers.tsx b/packages/app-explorer/src/NodeInfo/Peers.tsx
index 21a7bba92c..abb0b317fa 100644
--- a/packages/app-explorer/src/NodeInfo/Peers.tsx
+++ b/packages/app-explorer/src/NodeInfo/Peers.tsx
@@ -27,42 +27,37 @@ const renderPeer = (peer: PeerInfo): React.ReactNode => {
   );
 };
 
-const renderPeers = ({ peers, t }: Props): React.ReactNode => {
-  if (!peers || !peers.length) {
-    return (
-      <div className='ui disabled'>
-        {t('no peers connected')}
-      </div>
-    );
-  }
-
-  return (
-    <article>
-      <table>
-        <thead>
-          <tr>
-            <th className='roles'>{t('role')}</th>
-            <th className='peerid ui--media-medium'>{t('peer id')}</th>
-            <th className='number'>{t('best #')}</th>
-            <th className='hash'>{t('best hash')}</th>
-          </tr>
-        </thead>
-        <tbody>
-          {peers
-            .sort((a, b): number => b.bestNumber.cmp(a.bestNumber))
-            .map(renderPeer)
-          }
-        </tbody>
-      </table>
-    </article>
-  );
-};
-
-function Peers (props: Props): React.ReactElement<Props> {
+function Peers ({ peers, t }: Props): React.ReactElement<Props> {
   return (
     <section className='status--Peers'>
-      <h1>{props.t('connected peers')}</h1>
-      {renderPeers(props)}
+      <h1>{t('connected peers')}</h1>
+      {peers && peers.length
+        ? (
+          <article>
+            <table>
+              <thead>
+                <tr>
+                  <th className='roles'>{t('role')}</th>
+                  <th className='peerid ui--media-medium'>{t('peer id')}</th>
+                  <th className='number'>{t('best #')}</th>
+                  <th className='hash'>{t('best hash')}</th>
+                </tr>
+              </thead>
+              <tbody>
+                {peers
+                  .sort((a, b): number => b.bestNumber.cmp(a.bestNumber))
+                  .map(renderPeer)
+                }
+              </tbody>
+            </table>
+          </article>
+        )
+        : (
+          <div className='ui disabled'>
+            {t('no peers connected')}
+          </div>
+        )
+      }
     </section>
   );
 }
diff --git a/packages/app-explorer/src/NodeInfo/Summary.tsx b/packages/app-explorer/src/NodeInfo/Summary.tsx
index 6b3cd751cd..3fd8f1396c 100644
--- a/packages/app-explorer/src/NodeInfo/Summary.tsx
+++ b/packages/app-explorer/src/NodeInfo/Summary.tsx
@@ -6,7 +6,7 @@ import { I18nProps } from '@polkadot/react-components/types';
 import { Info } from './types';
 
 import BN from 'bn.js';
-import React from 'react';
+import React, { useState, useEffect } from 'react';
 import { SummaryBox, CardSummary } from '@polkadot/react-components';
 import { formatNumber } from '@polkadot/util';
 import { BestNumber, Elapsed } from '@polkadot/react-query';
@@ -18,82 +18,76 @@ interface Props extends I18nProps {
   info: Info;
 }
 
-interface State {
-  peerBest?: BN;
-}
+const ZERO = new BN(0);
+const EMPTY_INFO = { extrinsics: null, health: null, peers: null };
 
-class Summary extends React.PureComponent<Props, State> {
-  public state: State = {};
+function Summary ({ info: { extrinsics, health, peers } = EMPTY_INFO, nextRefresh, t }: Props): React.ReactElement<Props> {
+  const [peerBest, setPeerBest] = useState(ZERO);
 
-  public static getDerivedStateFromProps ({ info = {} }: Props): State | null {
-    if (!info.peers) {
-      return null;
+  useEffect((): void => {
+    if (!peers) {
+      return;
     }
 
-    const bestPeer = info.peers.sort((a, b): number => b.bestNumber.cmp(a.bestNumber))[0];
+    const bestPeer = peers.sort((a, b): number => b.bestNumber.cmp(a.bestNumber))[0];
 
-    return {
-      peerBest: bestPeer
+    setPeerBest(
+      bestPeer
         ? bestPeer.bestNumber
         : new BN(0)
-    };
-  }
-
-  public render (): React.ReactNode {
-    const { info = {}, nextRefresh, t } = this.props;
-    const { peerBest } = this.state;
-
-    return (
-      <SummaryBox>
-        <section>
-          <CardSummary label={t('refresh in')}>
-            <Elapsed value={nextRefresh} />
-          </CardSummary>
-          <CardSummary
-            className='ui--media-small'
-            label={t('total peers')}
-          >
-            {
-              info.health
-                ? `${info.health.peers.toNumber()}`
-                : '-'
-            }
-          </CardSummary>
-          <CardSummary
-            className='ui--media-small'
-            label={t('syncing')}
-          >
-            {
-              info.health
-                ? (
-                  info.health.isSyncing.valueOf()
-                    ? t('yes')
-                    : t('no')
-                )
-                : '-'
-            }
-          </CardSummary>
-        </section>
-        <section className='ui--media-large'>
-          <CardSummary label={t('queued tx')}>
-            {
-              info.extrinsics
-                ? `${info.extrinsics.length}`
-                : '-'
-            }
-          </CardSummary>
-        </section>
-        <section>
-          <CardSummary label={t('peer best')}>
-            {formatNumber(peerBest)}
-          </CardSummary>
-          <CardSummary label={t('our best')}>
-            <BestNumber />
-          </CardSummary>
-        </section>
-      </SummaryBox>
     );
-  }
+  }, [peers]);
+
+  return (
+    <SummaryBox>
+      <section>
+        <CardSummary label={t('refresh in')}>
+          <Elapsed value={nextRefresh} />
+        </CardSummary>
+        <CardSummary
+          className='ui--media-small'
+          label={t('total peers')}
+        >
+          {
+            health
+              ? `${health.peers.toNumber()}`
+              : '-'
+          }
+        </CardSummary>
+        <CardSummary
+          className='ui--media-small'
+          label={t('syncing')}
+        >
+          {
+            health
+              ? (
+                health.isSyncing.valueOf()
+                  ? t('yes')
+                  : t('no')
+              )
+              : '-'
+          }
+        </CardSummary>
+      </section>
+      <section className='ui--media-large'>
+        <CardSummary label={t('queued tx')}>
+          {
+            extrinsics
+              ? `${extrinsics.length}`
+              : '-'
+          }
+        </CardSummary>
+      </section>
+      <section>
+        <CardSummary label={t('peer best')}>
+          {formatNumber(peerBest)}
+        </CardSummary>
+        <CardSummary label={t('our best')}>
+          <BestNumber />
+        </CardSummary>
+      </section>
+    </SummaryBox>
+  );
 }
 
 export default translate(Summary);
diff --git a/packages/app-explorer/src/NodeInfo/index.tsx b/packages/app-explorer/src/NodeInfo/index.tsx
index e3c16c768d..8478e0a89a 100644
--- a/packages/app-explorer/src/NodeInfo/index.tsx
+++ b/packages/app-explorer/src/NodeInfo/index.tsx
@@ -37,26 +37,21 @@ function NodeInfo ({ t }: Props): React.ReactElement<Props> {
   const { api } = useContext(ApiContext);
   const [info, setInfo] = useState<Partial<Info>>({});
   const [nextRefresh, setNextRefresh] = useState(Date.now());
-  const [timerId, setTimerId] = useState(0);
-
-  const executeStatus = (isFirstRun = false): void => {
-    // eslint-disable-next-line @typescript-eslint/no-use-before-define
-    getStatus(isFirstRun).catch((): void => {});
-  };
-  const getStatus = async (isFirstRun: boolean): Promise<void> => {
-    if (isFirstRun || timerId) {
-      setInfo(await retrieveInfo(api));
-      setNextRefresh(Date.now() + POLL_TIMEOUT);
-      setTimerId(window.setTimeout(executeStatus, POLL_TIMEOUT));
-    }
-  };
 
   useEffect((): () => void => {
-    executeStatus(true);
+    const _getStatus = (): void => {
+      retrieveInfo(api).then(setInfo);
+    };
+
+    _getStatus();
+
+    const timerId = window.setInterval((): void => {
+      setNextRefresh(Date.now() + POLL_TIMEOUT);
+      _getStatus();
+    }, POLL_TIMEOUT);
 
     return (): void => {
-      window.clearTimeout(timerId);
-      setTimerId(0);
+      window.clearInterval(timerId);
     };
   }, []);
 
diff --git a/packages/app-explorer/src/NodeInfo/types.ts b/packages/app-explorer/src/NodeInfo/types.ts
index 11017acb33..ae3350bfdd 100644
--- a/packages/app-explorer/src/NodeInfo/types.ts
+++ b/packages/app-explorer/src/NodeInfo/types.ts
@@ -8,7 +8,7 @@ import { Vec } from '@polkadot/types';
 
 export interface Info {
   blockNumber?: BlockNumber;
+  extrinsics?: Vec<Extrinsic> | null;
   health?: Health | null;
   peers?: PeerInfo[] | null;
-  extrinsics?: Vec<Extrinsic> | null;
 }
diff --git a/packages/app-js/src/ActionButtons.tsx b/packages/app-js/src/ActionButtons.tsx
index f26f99ccb4..47893d315f 100644
--- a/packages/app-js/src/ActionButtons.tsx
+++ b/packages/app-js/src/ActionButtons.tsx
@@ -4,7 +4,7 @@
 
 import { BareProps, I18nProps } from '@polkadot/react-components/types';
 
-import React from 'react';
+import React, { useState } from 'react';
 import styled from 'styled-components';
 import { Button as SUIB, Popup } from 'semantic-ui-react';
 import { Button, Input } from '@polkadot/react-components';
@@ -22,135 +22,114 @@ interface Props extends BareProps, I18nProps {
   stopJs: () => void;
 }
 
-interface State {
-  isOpen: boolean;
-  shareText: string;
-  snippetName: string;
-}
+function ActionButtons ({ className, generateLink, isCustomExample, isRunning, removeSnippet, runJs, saveSnippet, stopJs, t }: Props): React.ReactElement<Props> {
+  const [isOpen, setIsOpen] = useState(false);
+  const [shareText, setShareText] = useState(t('Generate link to share code example'));
+  const [snippetName, setSnippetName] = useState('');
 
-class ActionButtons extends React.PureComponent<Props, State> {
-  public state: State = {
-    isOpen: false,
-    shareText: this.props.t('Generate link to share code example'),
-    snippetName: ''
+  const _generateLink = (): void => {
+    setShareText(t('Copied to clipboard'));
+    generateLink();
+  };
+  const _onShareClose = (): void => {
+    setShareText(t('Generate link to share code example'));
+  };
+  const _onChangeName = (snippetName: string): void => {
+    setSnippetName(snippetName);
+  };
+  const _onPopupOpen = (): void => {
+    setIsOpen(true);
+  };
+  const _onPopupClose = (): void => {
+    setSnippetName('');
+    setIsOpen(false);
+  };
+  const _saveSnippet = (): void => {
+    saveSnippet(snippetName);
+    _onPopupClose();
   };
 
-  public render (): React.ReactNode {
-    const { className, isCustomExample, isRunning, removeSnippet, runJs, stopJs, t } = this.props;
-    const { isOpen, shareText, snippetName } = this.state;
-
-    return (
-      <div className={`${className} action-button`}>
+  return (
+    <div className={`${className} action-button`}>
+      <Popup
+        content={shareText}
+        on='hover'
+        onClose={_onShareClose}
+        trigger={
+          <SUIB
+            circular
+            icon='share alternate'
+            onClick={_generateLink}
+          />
+        }
+        wide='very'
+      />
+      {
+      // FIXME: The <Popup /> event trigger on='hover' does not work together with the ui-app'
+      // <Button /> component. That's why the original Semantic UI component is being used here.
+      }
+      {isCustomExample && (
         <Popup
-          content={shareText}
+          content={t('Delete this custom example')}
           on='hover'
-          onClose={this.onShareClose}
           trigger={
             <SUIB
               circular
-              icon='share alternate'
-              onClick={this.generateLink}
+              icon='trash alternate outline'
+              negative
+              onClick={removeSnippet}
             />
           }
-          wide='very'
         />
-        {
-        // FIXME: The <Popup /> event trigger on='hover' does not work together with the ui-app'
-        // <Button /> component. That's why the original Semantic UI component is being used here.
-        }
-        {isCustomExample && (
-          <Popup
-            content={t('Delete this custom example')}
-            on='hover'
-            trigger={
-              <SUIB
-                circular
-                icon='trash alternate outline'
-                negative
-                onClick={removeSnippet}
-              />
-            }
+      )}
+      {!(isCustomExample) && (
+        <Popup
+          className='popup-local'
+          on='click'
+          onClose={_onPopupClose}
+          open={isOpen}
+          trigger={
+            <SUIB
+              circular
+              icon='save'
+              onClick={_onPopupOpen}
+            />
+          }
+        >
+          <Input
+            autoFocus
+            onChange={_onChangeName}
+            onEnter={_saveSnippet}
+            maxLength={50}
+            min={1}
+            placeholder={t('Name your example')}
+            value={snippetName}
+            withLabel={false}
           />
-        )}
-        {!(isCustomExample) && (
-          <Popup
-            className='popup-local'
-            on='click'
-            onClose={this.onPopupClose}
-            open={isOpen}
-            trigger={
-              <SUIB
-                circular
-                icon='save'
-                onClick={this.onPopupOpen}
-              />
-            }
-          >
-            <Input
-              autoFocus
-              onChange={this.onChangeName}
-              onEnter={this.saveSnippet}
-              maxLength={50}
-              min={1}
-              placeholder={t('Name your example')}
-              value={snippetName}
-              withLabel={false}
-            />
-            <Button
-              isDisabled={!snippetName.length}
-              isPrimary
-              label={t('Save snippet to local storage')}
-              onClick={this.saveSnippet}
-            />
-          </Popup>
-        )}
-        <Button
-          className='play-button'
-          icon='play'
-          isCircular
-          isPrimary
-          onClick={runJs}
-        />
-        <Button
-          icon='close'
-          isCircular
-          isDisabled={!isRunning}
-          isNegative
-          onClick={stopJs}
-        />
-      </div>
-    );
-  }
-
-  private generateLink = (): void => {
-    const { generateLink, t } = this.props;
-
-    this.setState({ shareText: t('Copied to clipboard') });
-    generateLink();
-  }
-
-  private onShareClose = (): void => {
-    this.setState({ shareText: this.props.t('Generate link to share code example') });
-  }
-
-  private onChangeName = (snippetName: string): void => {
-    this.setState({ snippetName });
-  }
-
-  private saveSnippet = (): void => {
-    const { state: { snippetName }, props: { saveSnippet } } = this;
-
-    saveSnippet(snippetName);
-    this.setState({ snippetName: '', isOpen: false });
-  }
-
-  private onPopupOpen = (): void => {
-    this.setState({ isOpen: true, snippetName: this.props.snippetName || '' });
-  }
-
-  private onPopupClose = (): void => {
-    this.setState({ snippetName: '', isOpen: false });
-  }
+          <Button
+            isDisabled={!snippetName.length}
+            isPrimary
+            label={t('Save snippet to local storage')}
+            onClick={_saveSnippet}
+          />
+        </Popup>
+      )}
+      <Button
+        className='play-button'
+        icon='play'
+        isCircular
+        isPrimary
+        onClick={runJs}
+      />
+      <Button
+        icon='close'
+        isCircular
+        isDisabled={!isRunning}
+        isNegative
+        onClick={stopJs}
+      />
+    </div>
+  );
 }
 
 export default translate(
diff --git a/packages/app-parachains/src/Overview/Chain.tsx b/packages/app-parachains/src/Overview/Chain.tsx
index 6973ab943c..72eea0c3b2 100644
--- a/packages/app-parachains/src/Overview/Chain.tsx
+++ b/packages/app-parachains/src/Overview/Chain.tsx
@@ -4,8 +4,8 @@
 
 import React from 'react';
 
-export default class Chain extends React.PureComponent<{}> {
-  public render (): React.ReactNode {
-    return null;
-  }
+type Props = {};
+
+export default function Chain (): React.ReactElement<Props> | null {
+  return null;
 }
diff --git a/packages/app-parachains/src/Overview/index.tsx b/packages/app-parachains/src/Overview/index.tsx
index 63ec1c90e3..2b6733d91e 100644
--- a/packages/app-parachains/src/Overview/index.tsx
+++ b/packages/app-parachains/src/Overview/index.tsx
@@ -8,15 +8,15 @@ import { Columar } from '@polkadot/react-components';
 import Parachains from './Parachains';
 import Summary from './Summary';
 
-export default class Overview extends React.PureComponent<{}> {
-  public render (): React.ReactNode {
-    return (
-      <>
-        <Summary />
-        <Columar>
-          <Parachains />
-        </Columar>
-      </>
-    );
-  }
+type Props = {};
+
+export default function Overview (): React.ReactElement<Props> {
+  return (
+    <>
+      <Summary />
+      <Columar>
+        <Parachains />
+      </Columar>
+    </>
+  );
 }