[ArtWomb]

>>> Ultralight can emit raw GPU geometry / low-level draw calls to paint directly on the GPU without an intermediate CPU bitmap. We recommend this integration method for best performance

This is sort of where I am, and a lot of people are doing similar explorations, in developing custom GUIs inside the browser that leverage WASM for high performance graphics. I'm using a hybrid bespoke GLSL translations and raw pixel manipulated bitmaps to Canvas2D, eventually targeting a custom webgpu renderer. Main issue is simply browser fragmentation. And, of course, ever larger data visualizations!