Laptop FPS lag when connected to a TV?

So i have a lenovo y50-70 with an i5 4210h 2.9 ghz cpu a gtx 960 2gb gpu 8gb of ram and it has a 1080p panel. When i connect this laptop to my 43' LG Cinema 3D 1080p tv games lag on it. When not connected to my tv i usualy get butter smooth performance running mortal kombat x on max out settings, but when i connect it to my tv there is noticeable lag in the game. All other games that i own aswell. I have no idea why this is happening. I tried so many things i found but no results. Please help. (btw the games are running on the gtx 960 and the lid is not closed. It's also connected to it's charger, the screens are set to tv only.)

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