Understood. When SIMD + Multithreading is default in browser you may find this changes - you can try it out under chrome://flags and enabling SIMD and restart browser to see what the future holds   But yes for some models WebGL offers better execution in which case we shall have to see if we can figure out a way to limit GPU execution  to allow GUI to update too as Chrome uses GPU to render DOM.  Please keep track of the bug I started on Github above and add any further observations or other people who are having this issue to that thread so the engineering team can see.