Performance in the initial world menu is great, moving the camera around is super smooth. When I open the static mesh editor or blueprint editor, it pops up another window, and performance is bad in its viewport. If I drag the tab and merge it to the first window, such that it is one window with multiple tabs, performance is good. UMG editor and event / function tabs of blueprint are unusable in separate windows, bad performance as tabs.
CPU usage is only about 12%, memory usage is only around 10%. There are no windows messages / notifications. This is a new install of Windows 10 on a new pc build. Using an i7 6700k over clocked to 4.5 ghz, gtx 980 ti, 32 gb of ddr4. Tried several graphics drivers with no difference. Currently using Geforce 358.78.
Performance is so bad it is really hurting my productivity.
Any help / tips is much appreciated.