Created attachment 8774561 [details] trace1.log See <http://icelandairwaves.is/line-up/>. I will attach a few of my about:checkerboard traces.
In all of these it looks like the painting is taking between 1-2 seconds, and the checkerboard occurs during that time, while the painted content is catching up.
Status: NEW → RESOLVED
Last Resolved: 2 years ago
Resolution: --- → DUPLICATE
Duplicate of bug: 1256677
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