# About mobile rendering issue

**URL:** <https://forums.unrealengine.com/t/about-mobile-rendering-issue/328830>\
**Category:** Rendering\
**Tags:** unreal-engine, iOS, Rendering, question\
**Created:** [August 16, 2015, 1:26am UTC](https://forums.unrealengine.com/t/about-mobile-rendering-issue/328830 "2015-08-16T01:26:07Z")\
**Posts on this page:** 1\
**Showing post:** 2

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**Author:** ![rckt26](https://d3kjluh73b9h9o.cloudfront.net/original/4X/2/8/5/28502927f1d97ba1051b3b47ccfe17233bf41ef0.png) [@rckt26](https://forums.unrealengine.com/u/rckt26)\
**Post date:** [August 16, 2015, 3:22am UTC](https://forums.unrealengine.com/t/about-mobile-rendering-issue/328830/2 "2015-08-16T03:22:02Z")

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I think this concerns the problem you are having.

“If you cook with Windows, the shaders will not be precompiled because there is no shader compiler program for Windows. It will compile the shaders at runtime if this is the case (it uses the offline/online flag for looking up the shader in the DerivedDataCache, so both modes live together correctly).”

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