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You're absolutely right, you either go for CSS 3D Transforms, or WebGL, WebGL being faster still.

What’s your take on 2d canvas? I always see these 2d Toole using webgl and wonder how big of a difference it is.

Filters of course work best in webgl. But the rest?

Also, do you use offscreencanvas in chrome?

Every operation is just way faster in WebGL.

I currently use WebGL for display preview and 2D canvas for generating the actual image.

I suspect you'll run into performance issues if you plan to animate the image in a 2D canvas context (like I do when rotating / flipping / etc.)

I've been planning to use offscreencanvas but haven't gotten around to it yet.