I play CSGO faster than 100 in the main menu, sometimes more than 200 FPS. Why did I enter the game at around 50, and sometimes it was 10?

The main menu is not stuck at all, because the origin engine has not been fully started. I mean completely start and get into the game.

There are several solutions:

Turn down the resolution. The fastest and most effective way, but it will seriously reduce the game experience.

Reduce the image quality. (Moderate and ordinary methods will not seriously reduce the game experience)

Change computer accessories. (slowest and most expensive, but it can solve the problem fundamentally)