I have updated to version 4.2 and since the update I now get a much lower frame rate when I run my game in Standalone mode. When I just run it in a Separate Window, it runs just fine. In fact it runs better than in 4.1.1.
I have tried to find any reason for this by disabling things and disabling or lowering render settings like post or shadows or any number of things but it’s always slower. Though disabling things can speed it up, as can be expected, it’s still much slower than just running in a Separate Window.
I am running a custom project although it’s a modified version of the 3rd Person Template. It’s not very resource intensive at all. Much less than most of the demo content from the market place. I am doing more testing to see if I can pin point a specific reason or feature that causes it.
My system specs…
Core i7 3770k,
16GB RAM,
Geforce 680 GTX (driver v337.88),
Win 8.1 64bit (fully updated),
UE4 v4.2