185635 2018-05-14 17:38:37 -0700 Web Inspector: Canvas: it takes over a minute to process a 2 second recording 2018-05-18 14:08:13 -0700 1 1 1 Unclassified WebKit Web Inspector WebKit Nightly Build All All RESOLVED WONTFIX https://bugs.webkit.org/show_bug.cgi?id=175282 InRadar P2 Normal --- 185758 173807 1 nvasilyev mattbaker hi inspector-bugzilla-changes mattbaker webkit-bug-importer oldest_to_newest 1423874 0 nvasilyev 2018-05-14 17:38:37 -0700 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. 1423875 1 webkit-bug-importer 2018-05-14 17:38:57 -0700 <rdar://problem/40240813> 1423960 2 hi 2018-05-15 01:23:35 -0700 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. 1425281 3 mattbaker 2018-05-18 14:08:13 -0700 This was addressed in https://bugs.webkit.org/show_bug.cgi?id=185758.