Start a server and instead of pressing start type "/devmap mp_backlot", backlot is an example, you can put any map. If you type "/timescale x" you can use it as a fake FPS thing, but it's not fake!

Before using timescale set your FPS to 85FPS, it doesn't matter if you can't get 85FPS!

Timescale 0.8 = 125FPS (jump longer)
Timescale 0.4 = 250FPS (jump a lot longer)
Timescale 0.3 = 333FPS (jump higher)
Timescale 0.1 = 1000FPS (run up slopes easily)

The one that lacks abit is 0.4 timescale, 250FPS, I don't know why, I'll try to get a different number, enjoy running up slopes without 1000FPS!