Very high CPU usage compared to Shadertoy about shader-toy HOT 2 OPEN

I don't know much about how integrated GPUs work, but I would assume that in this context GPU usage equates CPU usage. Correct me if I'm wrong.

I know the extension uses quite a lot of GPU time, depending on the shaders that are used. From my superficial investigation that might be related to THREE.js. The online version of shadertoy does not use the THREE.js framework, but afaik does all the webgl code themselves. But I can't say for sure if it is an issue with how we're using the library or if it is actually doing too much work. It is certainly something work investigating, but probably requires a more involved solution.

Do you have an example of which shaders cause the high usage or does it happen really on any shader?

from shader-toy.

Is this better in the latest version that uses async I/O?

from shader-toy.