I have previously posted this on the forums and have been asked to post it here.
I have a GTX 570 GPU and i5-760 OC’d to 3.37ghz CPU. I have 16 gigs of ram and the latest nvidia beta drivers for the GPU. My current issue is that no matter what I do, no matter what I disable, I am stuck at 20 FPS. Other people reported on the forums that they have 30-60 fps with the same GPU.
From what I have noticed the Editor refuse to fully use my CPU (max 10% usage) and my GPU. This even happen on simple scenes such as Tappy Chicken. Once built and run in a separate window, Tappy Chicken seems to run fine.
Thank you for your report. We were not able to investigate this on the engine version you reported, but there have been many version changes to UE4 since this question was first posted. With a new version of the Engine comes new fixes and it is possible that this issue has changed or may no longer occur. Due to timetable of when this issue was first posted, we are marking this post as resolved for tracking purposes.
If you are still experiencing the issue you reported in the current engine version, then please respond to this message with additional information and we will investigate as soon as possible. If you are experiencing a similar, but different issue at this time, please submit a new report for it.