Little fps on powerful PC (Counter-Strike: Global Offensive)

Hello everyone, greetings to all. In General I have 1080ti and 7700к and less than 100 fps in cs go
at the same Inferno 70-90.
all anything, but my monitor is 144гц and therefore it is necessary to solve the problem.
had helped to write in the console fps_max 0, but now nothing changes. how to solve the problem?