how can I fix fps drop ?

when I start th game with the fog removing config i get 60 fps but after 1 OR 2 gens my fps drops to 15 and comesback again to 60 at like the end of the match but i usualy die before it comes back cause of fps drop can anyone help

Firstly, remove the fps cap from %appdata% , inside your .ini file and make it "READ ONLY"

what are your pc specs example ram, cpu, gpu etc?

YT_Naze descriped it really well , just change this file. Its there to limit the Fps Rate