For some reason when using borderless windowed mode occasionally my game start lagging and when i alt tab in and out the lag gets removed but returns pretty often and its annoying. When switching to full screen it runs basically flawlessly BUT full screening this game makes my windows 8 blue screen :P

I have updated my Nvidia Geforce GTX 770 4gig even tried the newest beta driver which gave better results but the borderless windowed lag keeps returning, and i did not tune it. However, i did overclock my Intel Core i7-4770k to 4.3 ghz but ive monitored temperatures and they are around 40-45c when playing FFXIV: ARR.

Temperatures on my GPU are around 60c so its not an overheating issue.

I really dont know whats wrong. The game should be running good on this.
Any help would be appreciated