diff --git a/src/components/NoteCard/index.tsx b/src/components/NoteCard/index.tsx
index 9d4c70f..c63835d 100644
--- a/src/components/NoteCard/index.tsx
+++ b/src/components/NoteCard/index.tsx
@@ -3,11 +3,11 @@ import { isMentioningMutedUsers } from '@/lib/event'
 import { useContentPolicy } from '@/providers/ContentPolicyProvider'
 import { useMuteList } from '@/providers/MuteListProvider'
 import { Event, kinds } from 'nostr-tools'
-import { useMemo } from 'react'
+import { memo, useMemo } from 'react'
 import MainNoteCard from './MainNoteCard'
 import RepostNoteCard from './RepostNoteCard'
 
-export default function NoteCard({
+const NoteCard = memo(function NoteCard({
   event,
   className,
   filterMutedNotes = true
@@ -35,7 +35,17 @@ export default function NoteCard({
     )
   }
   return <MainNoteCard event={event} className={className} />
-}
+}, (prevProps, nextProps) => {
+  // Custom comparison function for memo
+  return (
+    prevProps.event.id === nextProps.event.id &&
+    prevProps.event.created_at === nextProps.event.created_at &&
+    prevProps.className === nextProps.className &&
+    prevProps.filterMutedNotes === nextProps.filterMutedNotes
+  )
+})
+
+export default NoteCard
 
 export function NoteCardLoadingSkeleton() {
   return (
diff --git a/src/components/NoteList/index.tsx b/src/components/NoteList/index.tsx
index d667145..ec3b152 100644
--- a/src/components/NoteList/index.tsx
+++ b/src/components/NoteList/index.tsx
@@ -79,6 +79,14 @@ const NoteList = forwardRef(
     const supportTouch = useMemo(() => isTouchDevice(), [])
     const bottomRef = useRef<HTMLDivElement | null>(null)
     const topRef = useRef<HTMLDivElement | null>(null)
+    
+    // Memoize subRequests serialization to avoid expensive JSON.stringify on every render
+    const subRequestsKey = useMemo(() => {
+      return JSON.stringify(subRequests.map(req => ({
+        urls: [...req.urls].sort(), // Create a copy before sorting to avoid mutation
+        filter: req.filter
+      })))
+    }, [subRequests])
 
     const shouldHideEvent = useCallback(
       (evt: Event) => {
@@ -252,7 +260,7 @@ const NoteList = forwardRef(
       return () => {
         promise.then((closer) => closer())
       }
-    }, [JSON.stringify(subRequests), refreshCount, showKinds])
+    }, [subRequestsKey, refreshCount, showKinds])
 
     useEffect(() => {
       const options = {
diff --git a/src/components/Profile/ProfileTimeline.tsx b/src/components/Profile/ProfileTimeline.tsx
index cb62c0c..4fc2c47 100644
--- a/src/components/Profile/ProfileTimeline.tsx
+++ b/src/components/Profile/ProfileTimeline.tsx
@@ -92,12 +92,19 @@ const ProfileTimeline = forwardRef<
       if (!searchQuery.trim()) {
         return eventsFilteredByKind
       }
-      const query = searchQuery.toLowerCase()
-      return eventsFilteredByKind.filter(
-        (event) =>
-          event.content.toLowerCase().includes(query) ||
-          event.tags.some((tag) => tag.length > 1 && tag[1]?.toLowerCase().includes(query))
-      )
+      // Pre-compute lowercase query once
+      const query = searchQuery.toLowerCase().trim()
+      // Pre-compute lowercase content and tags for each event to avoid repeated conversions
+      return eventsFilteredByKind.filter((event) => {
+        const contentLower = event.content.toLowerCase()
+        if (contentLower.includes(query)) return true
+        // Only check tags if content doesn't match
+        return event.tags.some((tag) => {
+          if (tag.length <= 1) return false
+          const tagValue = tag[1]
+          return tagValue && tagValue.toLowerCase().includes(query)
+        })
+      })
     }, [eventsFilteredByKind, searchQuery])
 
     // Reset showCount when filters change