fix(editor): throttle render linked doc card when blockUpdated (#9361)

[BS-2223](https://linear.app/affine-design/issue/BS-2223/性能问题：linked-doc-card-view加载西藏的文档，app-直接挂了)

blocksuite/affine/block-embed/src/common/render-linked-doc.ts

@@ -23,6 +23,12 @@ import { render, type TemplateResult } from 'lit';
 import type { EmbedLinkedDocBlockComponent } from '../embed-linked-doc-block/index.js';
 import type { EmbedSyncedDocCard } from '../embed-synced-doc-block/components/embed-synced-doc-card.js';
 
+// Throttle delay for block updates to reduce unnecessary re-renders
+// - Prevents rapid-fire updates when multiple blocks are updated in quick succession
+// - Ensures UI remains responsive while maintaining performance
+// - Small enough to feel instant to users, large enough to batch updates effectively
+export const RENDER_CARD_THROTTLE_MS = 60;
+
 export function renderLinkedDocInCard(
   card: EmbedLinkedDocBlockComponent | EmbedSyncedDocCard
 ) {

blocksuite/affine/block-embed/src/embed-linked-doc-block/embed-linked-doc-block.ts

@@ -23,7 +23,7 @@ import {
   matchFlavours,
   referenceToNode,
 } from '@blocksuite/affine-shared/utils';
-import { Bound } from '@blocksuite/global/utils';
+import { Bound, throttle } from '@blocksuite/global/utils';
 import { DocCollection } from '@blocksuite/store';
 import { computed } from '@preact/signals-core';
 import { html, nothing } from 'lit';
@@ -33,7 +33,10 @@ import { styleMap } from 'lit/directives/style-map.js';
 import { when } from 'lit/directives/when.js';
 
 import { EmbedBlockComponent } from '../common/embed-block-element.js';
-import { renderLinkedDocInCard } from '../common/render-linked-doc.js';
+import {
+  RENDER_CARD_THROTTLE_MS,
+  renderLinkedDocInCard,
+} from '../common/render-linked-doc.js';
 import { SyncedDocErrorIcon } from '../embed-synced-doc-block/styles.js';
 import {
   type EmbedLinkedDocBlockConfig,
@@ -301,24 +304,28 @@ export class EmbedLinkedDocBlockComponent extends EmbedBlockComponent<EmbedLinke
           });
         })
       );
+      // Should throttle the blockUpdated event to avoid too many re-renders
+      // Because the blockUpdated event is triggered too frequently at some cases
       this.disposables.add(
-        linkedDoc.slots.blockUpdated.on(payload => {
-          if (
-            payload.type === 'update' &&
-            ['', 'caption', 'xywh'].includes(payload.props.key)
-          ) {
-            return;
-          }
+        linkedDoc.slots.blockUpdated.on(
+          throttle(payload => {
+            if (
+              payload.type === 'update' &&
+              ['', 'caption', 'xywh'].includes(payload.props.key)
+            ) {
+              return;
+            }
 
-          if (payload.type === 'add' && payload.init) {
-            return;
-          }
+            if (payload.type === 'add' && payload.init) {
+              return;
+            }
 
-          this._load().catch(e => {
-            console.error(e);
-            this.isError = true;
-          });
-        })
+            this._load().catch(e => {
+              console.error(e);
+              this.isError = true;
+            });
+          }, RENDER_CARD_THROTTLE_MS)
+        )
       );
 
       this._setDocUpdatedAt();

blocksuite/affine/block-embed/src/embed-synced-doc-block/components/embed-synced-doc-card.ts

@@ -1,11 +1,14 @@
 import { ThemeProvider } from '@blocksuite/affine-shared/services';
 import { isGfxBlockComponent, ShadowlessElement } from '@blocksuite/block-std';
-import { WithDisposable } from '@blocksuite/global/utils';
+import { throttle, WithDisposable } from '@blocksuite/global/utils';
 import { html, nothing } from 'lit';
 import { property, queryAsync } from 'lit/decorators.js';
 import { classMap } from 'lit/directives/class-map.js';
 
-import { renderLinkedDocInCard } from '../../common/render-linked-doc.js';
+import {
+  RENDER_CARD_THROTTLE_MS,
+  renderLinkedDocInCard,
+} from '../../common/render-linked-doc.js';
 import type { EmbedSyncedDocBlockComponent } from '../embed-synced-doc-block.js';
 import { cardStyles } from '../styles.js';
 import { getSyncedDocIcons } from '../utils.js';
@@ -101,19 +104,23 @@ export class EmbedSyncedDocCard extends WithDisposable(ShadowlessElement) {
           renderLinkedDocInCard(this);
         })
       );
+      // Should throttle the blockUpdated event to avoid too many re-renders
+      // Because the blockUpdated event is triggered too frequently at some cases
       this.disposables.add(
-        syncedDoc.slots.blockUpdated.on(payload => {
-          if (this._dragging) {
-            return;
-          }
-          if (
-            payload.type === 'update' &&
-            ['', 'caption', 'xywh'].includes(payload.props.key)
-          ) {
-            return;
-          }
-          renderLinkedDocInCard(this);
-        })
+        syncedDoc.slots.blockUpdated.on(
+          throttle(payload => {
+            if (this._dragging) {
+              return;
+            }
+            if (
+              payload.type === 'update' &&
+              ['', 'caption', 'xywh'].includes(payload.props.key)
+            ) {
+              return;
+            }
+            renderLinkedDocInCard(this);
+          }, RENDER_CARD_THROTTLE_MS)
+        )
       );
     }
   }