Crt-mattias is very slow

Recently i have found this shader and i think it looks awsome, regardles how slow it is. On my 10 years old machine it freezes, it only works on newer and more powerful machines.

I don’t know much about shaders and how they work, but is there something that can be done to improve it’s performance?

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not exactly, but the author of that shader updated and improved it and made it much faster in the form of newpixie-crt.

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You can take a look at these Shader Presets as well. Some of them started off as customizations of a shader preset called NewPixie Clone by @HyperspaceMadness.

CyberLab Mega Bezel Death To Pixels Shader Preset Pack