On the PTS I am getting half the fps using the same settings I use on live.
My FPS goes back up to normal if I switch from 'Windowed(Fullscreen)' to 'Fullscreen' mode.
I have a 4k monitor and run windows in 3840x2160, but I set the game to 1920x1080.
Live
https://i.imgur.com/lWGm76C.jpg getting 74fps
PTS
https://i.imgur.com/B5YF5pN.jpg getting 34fps
I get the same low fps if I try to fullscreen @ 3840x2160 on live. So I feel like Windowed(Fullscreen) is trying to run at 4k on pts where it runs at the chosen resolution on live.
Windows 10 64bit
i7 6700k
GTX960 4gb driver ver 388.13
[DC/NA]