RESOLVED WONTFIX Bug 185635
Web Inspector: Canvas: it takes over a minute to process a 2 second recording 
https://bugs.webkit.org/show_bug.cgi?id=185635
Summary Web Inspector: Canvas: it takes over a minute to process a 2 second recording
Nikita Vasilyev
Reported 2018-05-14 17:38:37 PDT
Steps: 1. Go to http://www.blobsallad.se 2. Open Canvas tab in Web Inspector 3. Press the record button for the Blob canvas 4. Wait for two seconds 5. Press the stop button Actual: It took over a minute to show the recording. "Processing recording" stayed on for over a minute. Expected: The recording shows in a few seconds. If that isn't possible, it should show the recording with limited features at first.
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Radar WebKit Bug Importer
Comment 1 2018-05-14 17:38:57 PDT
<rdar://problem/40240813>
Devin Rousso
Comment 2 2018-05-15 01:23:35 PDT
This is most likely caused by <https://webkit.org/b/175282>. There is no "easy" way to quickly determine if a particular visual action caused some pixels to change on the canvas, so we have to resort to checking every single pixel. On larger canvases, this can take a long time, and the problem is compounded if there are a large number of visual actions in the recording.
Matt Baker
Comment 3 2018-05-18 14:08:13 PDT
This was addressed in https://bugs.webkit.org/show_bug.cgi?id=185758.
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