Edge cache or in-memory cache

Both work. The right pick depends on how often the feed changes and how many regions you serve. A quick comparison:

A typed example

type Feed = { items: { id: string; title: string }[]; updatedAt: number };
export async function readFeed(load: () => Promise<Feed>, ttl = 60_000) {
  const cached = cache.get("feed");
  if (cached && Date.now() - cached.updatedAt < ttl) return cached;
  const fresh = await load();
  cache.set("feed", fresh);
  return fresh;
}

Things to check before shipping:

1. Set a stale-while-revalidate window so readers never wait on a refresh.
2. Key the cache by locale, not just by path.
3. Log the hit rate for a week; then tune the TTL.

• Decide on a TTL
• Add a purge hook for editors

A cache you cannot purge is a bug waiting for a deadline.

More background lives in the sample caching guide.

Use readFeed() with a short TTL, then tune it. Avoid global shared keys.