When I have multiple (2-3+) editor windows open, e.g. static mesh editor window, mat instance editor window, the whole editor slows to a crawl, below 10 fps. This occurs even when the editors are tabbed and not currently being rendered. With a single editor window open performance is ok. This has …

Hey guys, Thanks for taking the time to elaborate and provide some extra information. We were able to reproduce this internally and have entered a bug report for the issue. You can track the issue by clicking the link below. UE-41678 Let me know if you have further questions or need additional as…

4.14.3 Bad performance with multiple windows open

Development Pipeline & Plugins

brothermechanic (brothermechanic) April 11, 2017, 6:39pm 11

i found solution here