(I haven't tested this in an opt build so I don't know how noticeable this is there, but presumably it's somewhat noticeable, particularly if you're on a slower system.)
Bug 1659207 Comment 3 Edit History
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(I haven't tested this in an opt build so I don't know how noticeable this is there, but presumably it's somewhat noticeable, particularly if you're on a slower system or if the portrait->landscape conversion takes a little while for whatever reason.)