Debugging Python Cold Starts with Sentry Profiling and improving our P99 latency by several seconds

Sentry, a company that builds debugging tools for developers, used its own platform to solve a performance issue causing significant latency spikes in their critical infrastructure. The problem was traced back to a classic cold start problem due to Python's lazy import system. By enabling profiling and warming up uWSGI workers, they reduced P99 response times from 2.4 seconds to 176 milliseconds for RPC endpoints.