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Optimizing Shader Performance for Real-Time Rendering
I’ve been working on a shader for a real-time rendering project, but I’m struggling with performance optimization. The shader looks great, but it causes a noticeable drop in FPS, especially on lower-end GPUs. I’m mainly using HLSL and working within Unreal Engine. Are there any best practices for reducing shader complexity… -
Re: Optimizing Shader Performance for Real-Time Rendering
you've got access to insights and gpu capture tools in unreal - you can also get things like renderdoc working so analysing a capture is easy enough. there is also the potential for branching to cause the gpu to stall while doing on demand shader compilation - not sure how bad the issue is on current unreal versions… -
Re: Optimizing Shader Performance for Real-Time Rendering
Why not discuss it here? -
Re: Optimizing Shader Performance for Real-Time Rendering
I know more about shader you can message me to let us discuss about it if you are on discord we can discussed about it there -
Re: Optimizing Shader Performance for Real-Time Rendering
Working with mobile GPUs a few years ago, we found the use of Pow was a big non-no for perf. So I had to use Add and Sub and Mult instead. I seem to recall some Unreal docu about shader perf, have you searched? It might be specifically for mobile. -
Re: Optimizing Shader Performance for Real-Time Rendering
A lot of shader performance comes down to your textures as well. If you can get away with less textures being accessed, you'll do better. Many materials just need a monochromatic albedo, tinted a color, so you can compress to the red channel, and pack other maps in with it. It's better to pack materials into less textures,… -
Re: Optimizing Shader Performance for Real-Time Rendering
at the most basic level.... you usually just start commenting stuff out and see what effect it has on frame rate or drop in a basic shader just to check its the root cause of slow down. Though you may need to accept that you need lower graphic quality on lower end cards. -
Re: Optimizing Shader Performance for Real-Time Rendering
Just saw this in my feed, maybe useful? https://www.linkedin.com/posts/wojciech-sterna-193a7b44_here-is-how-in-unreal-engine-5-i-profile-activity-7307698546730786816-Z9oA
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