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Improve ShaderGlass Performance and FPS

Slow ShaderGlass rendering usually needs a simpler effect, smaller processing resolution or fewer concurrent GPU-intensive tasks; the best adjustment depends on the selected preset.

Before you begin

Use Windows 10 version 2004 (build 19041) or Windows 11 and a DirectX 11-capable GPU. Confirm the source window or capture device works without additional post-processing. The exact labels can differ between ShaderGlass versions and operating modes.

Step-by-step workflow

1. Check whether the underlying application is already slow without any overlay.
2. Switch to a lightweight built-in shader to establish a baseline.
3. Lower capture/output resolution or rendering scale where the selected mode allows it.
4. Reintroduce visual features gradually and compare responsiveness after each change.

Important details and limitations

Complex CRT effects can involve multiple passes and high-resolution textures.

Running a demanding game and an intensive overlay on the same GPU can amplify latency.

Measure with a consistent application and scene; subjective comparison across different games is unreliable.

How to verify the result

Compare the processed scene with the same source shown without ShaderGlass. Watch for clipping, unexpected color changes, black regions and input lag. Keep one parameter fixed at a time while troubleshooting. For version-dependent settings, refer to the developer manual instead of relying on old screenshots.

Questions and answers

Does changing shaders affect FPS?

Yes. GPU workload varies significantly across filters.

Is turning off scanlines always the best fix?

No. First compare shader complexity and processing resolution.

Related guide: Troubleshooting · All ShaderGlass guides · Windows download information.

Technical reference: Developer manual. This guide explains settings and does not alter the ShaderGlass application or its license.