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the shader version is the fastest, but looks like modern art on my smartphone.

Like someone scribbled the colors over the circles instead of filling them.

It declares that floats should only be medium precision by default, but those precision specifiers are only followed on mobile platforms.

Desktop WebGL implementations just promote everything to high precision so that kind of bug is invisible until you test on mobile.

Thank you for pointing it out, I fixed it by now. :)

Fixed for me. Nice work

That's probably an implementation issues that manifests on your hardware called shadow acne/self intersection. It's explained here[0]