📜 refactor: Optimize Longer Message Thread Performance (#3610)

client/src/components/Chat/Messages/Content/Markdown.tsx

@@ -6,14 +6,13 @@ import supersub from 'remark-supersub';
 import rehypeKatex from 'rehype-katex';
 import { useRecoilValue } from 'recoil';
 import ReactMarkdown from 'react-markdown';
-import rehypeHighlight from 'rehype-highlight';
-import type { TMessage } from 'librechat-data-provider';
 import type { PluggableList } from 'unified';
+import rehypeHighlight from 'rehype-highlight';
 import { cn, langSubset, validateIframe, processLaTeX } from '~/utils';
 import CodeBlock from '~/components/Messages/Content/CodeBlock';
-import { useChatContext, useToastContext } from '~/Providers';
 import { useFileDownload } from '~/data-provider';
 import useLocalize from '~/hooks/useLocalize';
+import { useToastContext } from '~/Providers';
 import store from '~/store';
 
 type TCodeProps = {
@@ -22,20 +21,14 @@ type TCodeProps = {
   children: React.ReactNode;
 };
 
-type TContentProps = {
-  content: string;
-  message: TMessage;
-  showCursor?: boolean;
-};
-
 export const code = memo(({ inline, className, children }: TCodeProps) => {
-  const match = /language-(\w+)/.exec(className || '');
+  const match = /language-(\w+)/.exec(className ?? '');
   const lang = match && match[1];
 
   if (inline) {
     return <code className={className}>{children}</code>;
   } else {
-    return <CodeBlock lang={lang || 'text'} codeChildren={children} />;
+    return <CodeBlock lang={lang ?? 'text'} codeChildren={children} />;
   }
 });
 
@@ -110,18 +103,22 @@ export const p = memo(({ children }: { children: React.ReactNode }) => {
 });
 
 const cursor = ' ';
-const Markdown = memo(({ content, message, showCursor }: TContentProps) => {
-  const { isSubmitting, latestMessage } = useChatContext();
+
+type TContentProps = {
+  content: string;
+  isEdited?: boolean;
+  showCursor?: boolean;
+  isLatestMessage: boolean;
+};
+
+const Markdown = memo(({ content = '', isEdited, showCursor, isLatestMessage }: TContentProps) => {
   const LaTeXParsing = useRecoilValue<boolean>(store.LaTeXParsing);
 
   const isInitializing = content === '';
 
-  const { isEdited, messageId } = message ?? {};
-  const isLatestMessage = messageId === latestMessage?.messageId;
-
   let currentContent = content;
   if (!isInitializing) {
-    currentContent = currentContent?.replace('z-index: 1;', '') ?? '';
+    currentContent = currentContent.replace('z-index: 1;', '') || '';
     currentContent = LaTeXParsing ? processLaTeX(currentContent) : currentContent;
   }
 
@@ -143,18 +140,18 @@ const Markdown = memo(({ content, message, showCursor }: TContentProps) => {
     return (
       <div className="absolute">
         <p className="relative">
-          <span className={cn(isSubmitting ? 'result-thinking' : '')} />
+          <span className={cn(showCursor === true ? 'result-thinking' : '')} />
         </p>
       </div>
     );
   }
 
   let isValidIframe: string | boolean | null = false;
-  if (!isEdited) {
+  if (isEdited !== true) {
     isValidIframe = validateIframe(currentContent);
   }
 
-  if (isEdited || ((!isInitializing || !isLatestMessage) && !isValidIframe)) {
+  if (isEdited === true || (!isLatestMessage && !isValidIframe)) {
     rehypePlugins.pop();
   }
 
@@ -173,9 +170,7 @@ const Markdown = memo(({ content, message, showCursor }: TContentProps) => {
         }
       }
     >
-      {isLatestMessage && isSubmitting && !isInitializing && showCursor
-        ? currentContent + cursor
-        : currentContent}
+      {isLatestMessage && showCursor === true ? currentContent + cursor : currentContent}
     </ReactMarkdown>
   );
 });

client/src/components/Chat/Messages/Content/MessageContent.tsx

@@ -1,9 +1,10 @@
-import { Fragment, Suspense } from 'react';
+import { Fragment, Suspense, useMemo } from 'react';
 import type { TMessage, TResPlugin } from 'librechat-data-provider';
 import type { TMessageContentProps, TDisplayProps } from '~/common';
 import Plugin from '~/components/Messages/Content/Plugin';
 import Error from '~/components/Messages/Content/Error';
 import { DelayedRender } from '~/components/ui';
+import { useChatContext } from '~/Providers';
 import EditMessage from './EditMessage';
 import { useLocalize } from '~/hooks';
 import Container from './Container';
@@ -63,17 +64,31 @@ export const ErrorMessage = ({
 
 // Display Message Component
 const DisplayMessage = ({ text, isCreatedByUser, message, showCursor }: TDisplayProps) => {
+  const { isSubmitting, latestMessage } = useChatContext();
+  const showCursorState = useMemo(
+    () => showCursor === true && isSubmitting,
+    [showCursor, isSubmitting],
+  );
+  const isLatestMessage = useMemo(
+    () => message.messageId === latestMessage?.messageId,
+    [message.messageId, latestMessage?.messageId],
+  );
   return (
     <Container message={message}>
       <div
         className={cn(
-          showCursor && !!text.length ? 'result-streaming' : '',
+          showCursorState && !!text.length ? 'result-streaming' : '',
           'markdown prose message-content dark:prose-invert light w-full break-words',
           isCreatedByUser ? 'whitespace-pre-wrap dark:text-gray-20' : 'dark:text-gray-100',
         )}
       >
         {!isCreatedByUser ? (
-          <Markdown content={text} message={message} showCursor={showCursor} />
+          <Markdown
+            content={text}
+            isEdited={message.isEdited}
+            showCursor={showCursorState}
+            isLatestMessage={isLatestMessage}
+          />
         ) : (
           <>{text}</>
         )}

client/src/components/Chat/Messages/Content/Part.tsx

@@ -4,9 +4,11 @@ import {
   imageGenTools,
   isImageVisionTool,
 } from 'librechat-data-provider';
+import { useMemo } from 'react';
 import type { TMessageContentParts, TMessage } from 'librechat-data-provider';
 import type { TDisplayProps } from '~/common';
 import { ErrorMessage } from './MessageContent';
+import { useChatContext } from '~/Providers';
 import RetrievalCall from './RetrievalCall';
 import CodeAnalyze from './CodeAnalyze';
 import Container from './Container';
@@ -20,16 +22,30 @@ import { cn } from '~/utils';
 
 // Display Message Component
 const DisplayMessage = ({ text, isCreatedByUser = false, message, showCursor }: TDisplayProps) => {
+  const { isSubmitting, latestMessage } = useChatContext();
+  const showCursorState = useMemo(
+    () => showCursor === true && isSubmitting,
+    [showCursor, isSubmitting],
+  );
+  const isLatestMessage = useMemo(
+    () => message.messageId === latestMessage?.messageId,
+    [message.messageId, latestMessage?.messageId],
+  );
   return (
     <div
       className={cn(
-        showCursor && !!text.length ? 'result-streaming' : '',
+        showCursorState && !!text.length ? 'result-streaming' : '',
         'markdown prose message-content dark:prose-invert light w-full break-words',
         isCreatedByUser ? 'whitespace-pre-wrap dark:text-gray-20' : 'dark:text-gray-70',
       )}
     >
       {!isCreatedByUser ? (
-        <Markdown content={text} message={message} showCursor={showCursor} />
+        <Markdown
+          content={text}
+          isEdited={message.isEdited}
+          showCursor={showCursorState}
+          isLatestMessage={isLatestMessage}
+        />
       ) : (
         <>{text}</>
       )}

client/src/components/Chat/Messages/Content/SearchContent.tsx

@@ -46,7 +46,7 @@ const SearchContent = ({ message }: { message: TMessage }) => {
       )}
       dir="auto"
     >
-      <MarkdownLite content={message.text ?? ''} />
+      <MarkdownLite content={message.text || ''} />
     </div>
   );
 };