a quick question about Games lagg

May 2, 2018
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So not long ago my main hard drive died so i changed it with one i found lying around. and i remformated it and installed win 7 on it as it was on my last hard drive. and i installed all the drivers needed, but when i play like heartstone or league in windowd/boarderd mode i lagg when im watching somthing on youtube..(i have a 3 monitor setup) for some reason the fps still shows like 60-80. but i feel like its far less. and when i simply click away into another tab the lagg goes away or when i simply put on fullscreen mode. is there a way to maybe fix this or do i just have to deal with it ? might be that i have forgotten a driver or somthing.