Overwatch starts to get really slow and delayed after my computers been on for awhile?

g_ruch

Prominent
Sep 23, 2017
4
0
510
gpu temp is 39C, cpu is 37-39. if I turn my computer off for the night which I always do, I can turn it on in the morning and play games with no problems, no delay ingame. but after my comps been on for x hours my games to start to get really laggy, internet isn't a problem, something wrong with my computer i'm guessing but idk what it is?