Hello.When i play for example fortnite,csgo and other video games they cannot run at high resolution and i need to set it to the lowest resolution other wise it causes lag,i had my computer for half a year and and almost i have a pretty good monitor ,here are my computers specs Inter(R) Core(tm) i3-4170 cpu @ 3.70 hz and 8 gb ram ,i hope somebody can tell me how can i fix it.