NEW169575
Async image decoding is not enabled for directly composited images 
https://bugs.webkit.org/show_bug.cgi?id=169575
Summary Async image decoding is not enabled for directly composited images
Said Abou-Hallawa
Reported 2017-03-13 16:42:49 PDT
A test case like this does not benefit from the async image decoding. <img style="will-change: transform;" src="image.png”> Therefore, the decoding happens on the main thread which may affect the scrolling thread. 
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Radar WebKit Bug Importer
Comment 1 2017-03-13 16:44:56 PDT
<rdar://problem/31024295>
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