>>279711046
If you're wondering if a map is optimized press rightshift+backtick+1 through 6
The console and graphs will tell you what is lagging you. 
The madcat is ok but it doesn't do everything right.
Very few maps do.

Also all audio formats are converted when you compile a map by default.
All audio is converted to OGg on pc and the default import settings are often garbage.
Background music or ambience should always be set to streaming, for example. The performance impact of this is not insignificant.
If the reflection probe is active in the scene it's doing rendering things for literally every player in the map all the time: it needs to be disabled and literally inside the lightmapper settings statically to not be a source of latency.