Scaling Past 1,000 Users: The 2026 Playbook

The app that was perfect at 100 users cracks around 1,000. The same four things break first, in order:

Slow DB queries — missing indexes, N+1s (instant on small tables, crawl on big ones). Profile, index hot paths, kill N+1s.
No caching — put heavy, stable reads behind a cache.
Synchronous work — move emails/reports/slow 3rd-party calls to background jobs on a queue.
No monitoring — add observability so it tells you before angry users do.

Not exotic — just the playbook nearly every product needs at this size.

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