UE4 Lags, everytime i right click or use blueprint editor my fps drops and ms become larger, what do i do to fix this?

Development Programming & Scripting
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This problem suddenly appeared, i tried everything - reinstalling ue4, changing settings and other things

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Okay so i solved problem i guess, i was starting ue4 using epic games laucher and when i started it using exe file then it worked fine and smoothly.

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Lags stopped only with UI and when i start game the editor freezes even if its blank project. Ui still lags a bit.

I created new project and no lags and freezes maybe some project files got corrupted?

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Hey there @Nemo_Vowux! Welcome to the community! Since you mentioned this is only occurring on one project, it sounds like there could be some issues with cached data or shaders if the source of the slowdown isn’t your scene. Does the issue occur even on blank levels inside that specific project? Are shaders regenerating for a long period of time when the editor first opens?

One of the first things to do when a project is specifically acting up and it doesn’t seem to be the fault of your scene’s performance would be to clear all temporary data associated with the project.

To do this, first back the project up safely because in some rare cases this could break things.

Next, delete the DerivedDataCache, Intermediate, and Saved folders from your project. These folders will be regenerated when you next launch the project, and shaders will take some time to rebuild so expect a longer first launch.

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Hello, thanks for message, i did what you said but ui still lags like when i rename blueprint a copy appears and then disappear after i as example look at some folder or do something other, this only in one project and on others everything works fine. One problem is that i supposed to launch ue4 from folder instead of epic games, if i start it from epic games and not directly then UI lags and all stuff happens. I hope this problem wont start again and i can dev peacefully, i still dont know what made it happen maybe some Epic Games bug or other things.

Edit: Okay so i learned something new, if i try to open the uproject file in bugged project it dont work but with others it work fine, i guess something is wrong with this blank project.

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That’s interesting! If it’s only this project, you may be able to migrate what you have to another project as a test.