It sounds like you want BokehJS. It was one of the alternatives I was recommended while I was exploring, but for various reasons my particular use case is not s

It sounds like you want BokehJS. It was one of the alternatives I was recommended while I was exploring, but for various reasons my particular use case is not so easy to integrate (plus my backend was already in Rust). https://github.com/bokeh/bokeh https://github.com/bokeh/bokeh I did do a basic test, and the raw rects-on-screen performance is roughly comparable to my final solution.