perf: add deriveDedupedProfile to cache profile store instances by pubkey

src/app/core/state.ts

@@ -147,6 +147,7 @@ import {
   makeUserData,
   makeUserLoader,
   manageRelay,
+  deriveProfile,
   displayProfileByPubkey,
   getProfile,
 } from "@welshman/app"
@@ -155,6 +156,25 @@ import {readFeed} from "@lib/feeds"
 
 export const fromCsv = (s: string) => (s || "").split(",").filter(identity)
 
+const profileStoreCache = new Map<string, ReturnType<typeof deriveProfile>>()
+
+export const deriveDedupedProfile = (
+  ...args: Parameters<typeof deriveProfile>
+): ReturnType<typeof deriveProfile> => {
+  const key = JSON.stringify(args)
+  const cached = profileStoreCache.get(key)
+
+  if (cached) {
+    return cached
+  }
+
+  const store = deriveProfile(...args)
+
+  profileStoreCache.set(key, store)
+
+  return store
+}
+
 export const ROOM = "h"
 
 export const PROTECTED = ["-"]