# Changing a single shader (PathTracing.usf) takes a hour to build

**URL:** <https://forums.unrealengine.com/t/changing-a-single-shader-pathtracing-usf-takes-a-hour-to-build/1954076>\
**Category:** Platform & Builds\
**Tags:** unreal-engine, question\
**Created:** [July 29, 2024, 8:05am UTC](https://forums.unrealengine.com/t/changing-a-single-shader-pathtracing-usf-takes-a-hour-to-build/1954076 "2024-07-29T08:05:27Z")\
**Posts on this page:** 1\
**Showing post:** 4

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**Author:** ![Jimbohalo10](https://d1ap1mz92jnks1.cloudfront.net/user_avatar/forums.unrealengine.com/jimbohalo10/32/961440_2.png) [@Jimbohalo10](https://forums.unrealengine.com/u/Jimbohalo10)\
**Post date:** [July 29, 2024, 4:19pm UTC](https://forums.unrealengine.com/t/changing-a-single-shader-pathtracing-usf-takes-a-hour-to-build/1954076/4 "2024-07-29T16:19:30Z")

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hi @dnayzue ,

Here is a link to my version 5.4.3 version of the code.  
[UnrealEngine-5/README.md at lgpu542 · jimshalo10/UnrealEngine-5 (github.com)](https://github.com/jimshalo10/UnrealEngine-5/blob/lgpu542/README.md)

This has been refined and tested over many version of UE5

You are welcome to download , which is for [Luoshuang’s GPULightmass Unreal Engine 5.4.3](https://forums.unrealengine.com/t/luoshuang-s-gpulightmass-unreal-engine-5-4-3-patch/1905932) a Nvidia GTX/RTX Lighting Bake much faster than CPU.

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