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Compiling shaders every time I open a project

I've been having a strange problem recently. For some reason, every time I start up my project, the shaders have to compile. It's usually around 5,000 or so. I searched the answer hub and help forum and couldn't find anything that might specifically fix my problem, but here's a couple of things I noticed.

  • The shaders that must compile involve the materials used in landscapes that blend different materials together. (For example, I have a Forest Material that blends different types of grass materials together.)

  • The game slows to a complete crawl if I try to run it while it's compiling.

  • Trying to save a material while it's compiling has a chance of causing it to lock up at 50%

  • Just by the design of my game, I have a large persistent level with many different sublevels. When I unhide these areas or go to them when playing in the viewport, I get "Texture Pool is Streaming Over" usually in the range 5 MB to 100 MB. This remains until I close the project.


  • I've tried resaving all the materials and it had no effect.

  • I've deleted things like the Intermediate folder and the cache but it had no effect.

  • I've also verified the installation of UE4.

My guess is that the problem has to do with those landscape textures specifically, but I'm not sure what I would do to address it.

I don't remember when this problem started, but I've been making biweekly to monthly backups of my game. I'm hesitant to migrate all my assets to another project because it's pretty large in size and requires a lot of different textures. (Currently have about 300+ though a good chunk are leftovers from the starter content pack).

I've also attached my DxDiag if it's necessary.

alt text

Product Version: UE 4.18
dxdiag.png (23.2 kB)
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asked Dec 23 '17 at 04:12 PM in Rendering

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2 answers: sort voted first

I happened to try the solution posted on this thread and it worked for me! The project now starts up without having to recompile everything.


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answered Dec 30 '17 at 03:42 AM

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delete "DerivedDataCache" folder in your c: install directory, and it will help with fixing the problem.

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answered Feb 24 '18 at 04:48 PM

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