Have you think of how many summation & multiply operations can you do within for-loops in GPU fragment shader?

I irrigorously tested the following fragment shader on ShaderToy, which gives me 100,000 operations at 22 FPS on a GTX 1080, for 25, 000 operations, it runs smoothly at 60 FPS.

So, what’s the limitation of your GPU processors?

Warning: Your WebGL may crash if you move to the rightwards.

Source Code