RESOLVED FIXED308776
Move dataURL creation in tabsCaptureVisibleTab to background thread 
https://bugs.webkit.org/show_bug.cgi?id=308776
Summary Move dataURL creation in tabsCaptureVisibleTab to background thread
Ben Nham
Reported 2026-02-26 14:04:25 PST
A significant number of MobileSafari hangs in telemetry are coming from the creation of the data url for the snapshotted tab in WebExtensionContext::tabsCaptureVisibleTab. Creating the data URL involves both encoding the snapshot as a PNG and turning it in to a data URL and this blocks the main thread of MobileSafari. Move this work to a background thread instead.
Attachments
Add attachment proposed patch, testcase, etc.
Ben Nham
Comment 1 2026-02-26 14:04:48 PST
<rdar://problem/170628256>
Ben Nham
Comment 2 2026-02-26 14:05:59 PST
Pull request: https://github.com/WebKit/WebKit/pull/59535
EWS
Comment 3 2026-02-26 16:21:16 PST
Committed 308309@main (00af076154b0): <https://commits.webkit.org/308309@main> Reviewed commits have been landed. Closing PR #59535 and removing active labels.
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