So My rig right now is:
-Nvidia GTX 1070 FE
-16gb mixed ram
-1tb samsung 860 Evo
-1tb WD Blue
-main monitor: Benq XL2420Z 1080p 144hz
-secondary monitor: Samsung U28E510 4k 60hz
So my issue is, everytime I play a game on my main monitor and something moves on my secondary monitor my game has lag issues. It feels like the frames are dipping below 60fps but the thing is, fraps and the in game fps counter is showing well above 144 frames consistently. This doesn't happen if my 4k monitor is static but if even the slightest thing moves on my 4k monitor, the game lags. Please help I have no idea what the issue is. I tried putting a different graphics card in there and even tried seeing if my cables are messed up and nothing solved it.