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perf(components): prevent rerenders from updatingState

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Use Zustand selectors with custom equality functions to only subscribe to specific fields needed by components, avoiding unnecessary rerenders when transient state like updatingState changes. Extract offline indicators into separate components to isolate rerenders. Memoize card components in catalog and popular threads views.
This commit is contained in:
plebeius
2026-01-02 16:42:16 +01:00
parent 764b4258e6
commit fa32833b2a
15 changed files with 446 additions and 322 deletions
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src/components/reply-modal/reply-modal.tsx
+4 -4
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@@ -2,7 +2,7 @@ import { useEffect, useRef, useState } from 'react';
import { useLocation, useParams } from 'react-router-dom';
import { Trans, useTranslation } from 'react-i18next';
import { setAccount, useAccount } from '@plebbit/plebbit-react-hooks';
import useSubplebbitsStore from '@plebbit/plebbit-react-hooks/dist/stores/subplebbits';
import { useSubplebbitField } from '../../hooks/use-stable-subplebbit';
import { formatMarkdown } from '../../lib/utils/post-utils';
import { getFormattedTimeAgo } from '../../lib/utils/time-utils';
import { isValidURL } from '../../lib/utils/url-utils';
@@ -140,9 +140,9 @@ const ReplyModal = ({ closeModal, showReplyModal, parentCid, parentNumber, threa
const location = useLocation();
const isInAllView = isAllView(location.pathname);
const isInSubscriptionsView = isSubscriptionsView(location.pathname, useParams());
const subplebbit = useSubplebbitsStore((state) => state.subplebbits[subplebbitAddress]);
const { updatedAt } = subplebbit || {};
const isBoardOffline = subplebbit?.updatedAt && subplebbit.updatedAt < Date.now() / 1000 - 60 * 60;
// Only subscribe to updatedAt to avoid rerenders from updatingState changes
const updatedAt = useSubplebbitField(subplebbitAddress, (subplebbit) => subplebbit?.updatedAt);
const isBoardOffline = updatedAt && updatedAt < Date.now() / 1000 - 60 * 60;
const offlineAlert = updatedAt
? isBoardOffline && (
<div className={styles.offlineBoard}>