Low FPS on second HDMI monitor

[Zub]

I've revered to windowed, as alt-tabbing is a pain, but there is definitely a better fps in fullscreen.

Both monitors seem to be on same color settings
While looking at those settings however i tried to make my external monitor the primary ("Make this the main display") and suddenly the game started showing 60fps again.
then I restarted Wow and it got real confused -started on the laptop screen with the wrong resolution, couldnt click any buttons etc.

I'll look at your other suggestions

[johny_mnemonic]

I had same problem, good fps on primary monitor, bad fps on second. It turned out that the problem was second monitor was running on virtual graphic. I dont know, how it appeared in my system. Maybe with some driver reinstall.. But I removed the virtual graphic from system and the second monitor started running on physical VGA. This solved my problems with < 30 FPS on second monitor.

[Zub]

I had same problem, good fps on primary monitor, bad fps on second. It turned out that the problem was second monitor was running on virtual graphic. I dont know, how it appeared in my system. Maybe with some driver reinstall.. But I removed the virtual graphic from system and the second monitor started running on physical VGA. This solved my problems with < 30 FPS on second monitor.

Is this a setting in-game? (i guess nor) or nvidia?
Not sure how to go and change this
cheers