# Why does an "Initializing World" Message appear when I change a USF file?

**URL:** <https://forums.unrealengine.com/t/why-does-an-initializing-world-message-appear-when-i-change-a-usf-file/298817>\
**Category:** Rendering\
**Tags:** initialize, unreal-engine, editor, shader, question\
**Created:** [November 12, 2014, 11:52am UTC](https://forums.unrealengine.com/t/why-does-an-initializing-world-message-appear-when-i-change-a-usf-file/298817 "2014-11-12T11:52:24Z")\
**Posts on this page:** 1\
**Page:** 1

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**Author:** ![dsl\_1](https://d3kjluh73b9h9o.cloudfront.net/original/4X/2/8/5/28502927f1d97ba1051b3b47ccfe17233bf41ef0.png) [@dsl\_1](https://forums.unrealengine.com/u/dsl_1)\
**Post date:** [November 12, 2014, 11:52am UTC](https://forums.unrealengine.com/t/why-does-an-initializing-world-message-appear-when-i-change-a-usf-file/298817/1 "2014-11-12T11:52:24Z")

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This is more of an annoyance than anything else, but here goes:

I’m using an USF file to implement a compute shader. If I apply changes to it and recompile shaders while in the editor (by pressing Ctrl+Shift+.), it takes no time at all and there’s a good workflow.

However, if I DON’T have the editor open and apply a change to the shader code, when I open the editor I’m welcomed by an “Initializing World” message (attached image 1) for quite some time (~1-2 minutes). Checking the task manager I notice that there are shader compilers running (attached image 2), so I’m assuming it’s compiling a whole lot of shaders it needs.

**What’s the main difference between having the editor opened or closed that triggers this effect? Also, is there some kind of solution?**

I would really prefer being able to make changes without the need of remembering to have the editor opened all the time. Anyway, as I said, its really just an annoyance right now.

Thanks in advance!