There is sadly nothing (to my knowledge) that can be done about this.
Intense analysis showed that animation based variable changes which intern result in color changes trigger a full redraw of all components and not just a repaint. This comes down to how the chromium engine works.
When there is plugin support with a JS API in the future it might be possible to handle the animation in JS which could directly set the CSS colors to skip the redraw step.
This is just an idea though that I have not yet tested.
EDIT: This is the exact reason I only added the Screech version when multiple people specifically asked me for it. It has a much higher impact on performance than the other RGB but the animation is smooth.
