Performance Lessons from 10,000 Concurrent Users

What happened when our launch went viral, the bottlenecks we hit, and how we scaled without rearchitecting.

It was 11 PM on a Tuesday when our Slack channel exploded. A popular creator mentioned our tool in a video, and suddenly we had 10,000 people trying to access our site simultaneously. The fix was not glamorous. We enabled connection pooling, optimized slow queries, and added caching.

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