"Everything looks fine in our performance tests, but production is slow."

I hear this all the time. Your load tests pass. NeoLoad shows good numbers.
But real users are complaining. Something's wrong, and nobody knows what.

This is when you need to be a detective.

In this talk, I'll walk you through three real mysteries I solved at work.
Each one seemed impossible at first. The load testing tools pointed one way.
The monitoring tools pointed another way. And the real problem? It was hiding
somewhere we didn't expect.