buy better pc bro...and stop make irellevant topics
Aida64 play until your fps starts droping alt tab open aida check temps
Is it perhaps thread starvation? Check console it should say something like performance warning usually caused by thread starvation or something.
I got the same issue but my fps drops from 120 to unplayable at 15-30 no idea how to fix it.
high temperatures>cpu or gpu can not keep up that pace and drops down the Mhz its working on
lower Mhz> slower pc performance
slower performance> less fps
just shift+ctrl+esc and monitor your temperatures while playing contra or download smth like aida64 or occt or furmark to stress test cpu and gpu in order to confirm its due to overheat or reject and move on with other ideas
you bought the PC from Albania ? maybe you got...
it can be temp, so check out the status of your thermal paste and if needed change it, check for dust if there is not too much in your coolings (cpu and gpu) and if with that you still have issues, check if you don't have a malware with the task manager.