diff --git a/packages/frontend/src/cache.ts b/packages/frontend/src/cache.ts
index ef6ffef..ffd0ce8 100644
--- a/packages/frontend/src/cache.ts
+++ b/packages/frontend/src/cache.ts
@@ -87,15 +87,19 @@ export const denormalizePiece = ({
 	Effect.flatMap(denormalizeSystemInformation),
 );
 
+const CacheSemaphore = Effect.unsafeMakeSemaphore(4);
+
 export const userLookup = (userId: UserId) => pipe(
 	Effect.promise((signal) => client.user({ userId }).get({ fetch: { signal } })),
 	Effect.flatMap(mapResponse),
+	CacheSemaphore.withPermits(1),
 );
 
 export const pieceLookup = (pieceId: PieceId) => pipe(
 	Effect.promise((signal) => client.piece({ pieceId }).get({ fetch: { signal } })),
 	Effect.flatMap(mapResponse),
 	Effect.flatMap(denormalizePiece),
+	CacheSemaphore.withPermits(1),
 );
 
 export const userCache = Effect.runSync(Cache.make({