So i use 2 monitors and i have GTX 970 Intel i7-5820k and 16gb of ram so whenever i play games they run really smoothly (For example Overwatch runs at 140-200fps at high settings) but whenever i watch Youtube videos with my other monitor everything is fine even when it's at 1080p but as soon as i go full screen on Youtube my fps drops a lot like to 30-40fps and i was wondering how i could fix that (using windows 10 btw)