Fun fact: When you pinch zoom in Firefox with WebRender enabled, it's actually rerendering all the text on CPU every frame. Turns out this can be fast! The trick is to be very good at caching.
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This isn't actually true anymore :) You can verify by setting gfx.webrender.debug.glyph-flashing=true.
But it was true and worked ok.
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Yeah, and then re-renders when the zoom gesture ends.