Investigate performance issues with recording replay canvas #10497

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1. billyvg

   added

   Package: replay

   on Feb 5, 2024
2. bruno-garcia commented on Feb 26, 2024

   

   bruno-garcia

   on Feb 26, 2024

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   We'll potentially move the createImageBitmap call to the web worker. Further investigation needed
3. billyvg commented on Mar 12, 2024

   

   billyvg

   on Mar 12, 2024

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   • We can't move createImageBitmap to web worker because:
     • we would need to transfer canvas to webworker which can only be done if we convert it to offscreen canvas
       • by transferring control to offscreen canvas, we cannot write to the canvas from the UI
     • it might be possible to clone the canvas and transfer it to web worker -- initial benchmarks seem to indicate that copying the canvas is faster than createImageBitmap, though probably increased memory usage

   Though, from looking at recent profiles, I don't see createImageBitmap as that big of an issue -- I see more main thread blocking from toDataURL when serializing the initial DOM snapshot. Have not gotten around to investigating that yet.

   👍React with 👍2Reacted by Jonas and Bruno Garcia
4. mydea commented on Dec 11, 2024

   

   mydea

   on Dec 11, 2024

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   @billyvg I am closing this for now as I do not think we have any work planned on this - we can always reopen if relevant!
5. mydea

   closed this as not plannedon Dec 11, 2024
6. ghost added

   Task

   on Aug 12, 2025