I don't have a lot of experience but https://animejs.com/ comes to mind. I'm not sure how the rendering works in WebGPU with changing inputs either. For example, does Svader cap at 60fps or the browser refresh rate? Do you use requestAnimationFrame? Thanks again.
If the animation engine is capable of smoothly changing a value in JS, I think it would already integrate very well with Svader.
The way the reactive rerendering works, is that every time a change in the input parameters is detected it queues a requestAnimationFrame, so yes, it follows the browser refresh rate.
Since Svelte 5 is automatically able to track changes in values, both by reassignment as well as object mutation, anything that changes a value -- no matter if it's designed for Svelte or not -- should be able to integrate smoothly.