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This is awesome, thanks for sharing!

One question, on your previous version you had a ton of big purple timeline bars. Were those mostly "recalculate styles" or "update layer trees"? I'm having similar issues and I'm wondering if canvas may be a better decision than DOM.

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I am quite certain there was a mix of both, but I honestly cannot remember the details of the timeline. Basically, if your bottleneck is moving lots of DOM elements around, then clustering is a good next step (depending on your use case). If not, then canvas tiles have worked very well for us.

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