|"im getting 15-20 fps on cs go"|
That could be a lot of things. Have you tweaked your system for best performance? Drivers all up to date? Managed your startup apps so you don't have a bunch of useless crap loading & running in the background? Do you regularly run a cleaner such as CCleaner-Slim (or Hillary's favorite, BleachBit)? Do you regularly scan for viruses & malware?
You can try lowering you game settings & game resolution but 1st see how "Can You Run It" rates your system: