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> I assume that means it is rendering an entirely new image each frame... which is a tad wild.

What's wild about that? That's exactly what it's doing and what most uses of canvas/WebGL do.

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It's wild if it's running at 400 fps because nobody has a screen that refreshes at 400Hz. Every frame rendered past the screen refresh rate is wasted compute. Easily solved by limiting the frame rate.
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It's not running at 400 fps, the UI has the current global listener count next to a button that says "fps". The fps is only shown once you click that button. Weird design, I know.
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