Match your sensitivity in CS:GO and desktop for better performance with training games (like aim400kg.ru, aimbooster.com, missionred etc.)
Calculations are based on orthographic projection and strictly valid for small rotation angles, for wider angles please use relative error estimation (the lower the better).
Vertical FOV is the same for different resolutions
How FOV works:
Due to projection of 3D world to 2D screen, objects that closer to sides are wider
At the center:
Red box at the center of the screen takes 150px
At the side:
Same red box, but at the side, now takes 330px. Player didn't move, just rotated his view.
Windows Pointer Speed:
String variable, values: 1...20