1 files changed, 10 insertions, 1 deletions
diff --git a/src/nostr.js b/src/nostr.js
index e414d57..b76e865 100644
--- a/src/nostr.js
+++ b/src/nostr.js
@@ -466,7 +466,16 @@ export function parseNostrPubkey(input) {
   return null;
 }
 // An npub or 64-hex nostr pubkey → hex, or null if it isn't one.
-export function npubOf(pkHex) { try { return npubEncode(pkHex); } catch { return null; } }
+// Memoized: the feed asks for the reader's npub thousands of times while it
+// filters rows, and bech32 encoding was the top self time of a scroll.
+const npubMemo = new Map();
+export function npubOf(pkHex) {
+  if (npubMemo.has(pkHex)) return npubMemo.get(pkHex);
+  let v = null; try { v = npubEncode(pkHex); } catch {}
+  if (npubMemo.size > 4000) npubMemo.clear();
+  npubMemo.set(pkHex, v);
+  return v;
+}
 // An event reference other clients can resolve: the id plus who wrote it, so
 // a quote can be fetched even by someone who doesn't have it yet.
 export function neventOf(id, author) { try { return neventEncode({ id, author }); } catch { return null; } }