C:\Users\\AppData\Local\UnrealEngine\Common\DerivedDataCache\4\8 "Filling Up my C Drive!"

You can delete the folder and start a new one, but your projects will have to recompile all the shaders again. It will take them time to launch and will look like it’s frozen, just let it go. This is also the only way to clean out shaders from old projects no longer being worked on, I really wish epic would store them in subfolders for each project in the folder we choose.

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