Have you used profiling tools to analyze performance?

Yes, Go has built-in profiling tools such as pprof that allow analyzing application performance. They can measure CPU profiling, memory usage, blocking, and goroutine tracing.

Usage example:

1. Import the net/http/pprof package into your application to expose profiles via HTTP.
2. Run the application and collect a profile using the command:

 go tool pprof http://localhost:6060/debug/pprof/profile?seconds=30

3. Analyze the obtained profile to identify bottlenecks and optimize the code.

These tools help understand where the application spends most resources and time, which is critical for performance optimization.