https://dev.johnnymetz.com/tags/caching/ Recent content in Caching on Johnny Metz Hugo en Sun, 25 Oct 2026 12:00:00 -0400 https://dev.johnnymetz.com/posts/caching-at-scale-in-django/ Sun, 25 Oct 2026 12:00:00 -0400 https://dev.johnnymetz.com/posts/caching-at-scale-in-django/ <p>My team runs a multi-tenant Django API that serves browser extensions. Traffic arrives in waves: a company&rsquo;s employees all log on in the same minute, or a customer pushes an update to every user at once. Traffic grew about 20x in two years. The API peaks around 1,100 requests per second on a typical weekday. The busiest moment we have seen, a large customer pushing an update to all of its users at once, hit 2,000. Postgres sees about 0.3 queries per request. Redis serves the rest at a 97% hit rate. Caching was the biggest lever, and here is what we learned.</p>