Yes that's correct, I saw this problem only with document splitting so far. (comment 2) My subjective perception in the past was that document splitting felt a bit heavier on this Macbook than without. But things have improved, too! I've put bug 1568684 in "See Also" as it's the only other "urlbar border is somewhat corrupt" bug. If I don't see this the next two weeks it will be closed as WFM. Please only be worried about bug 1538540 at this point which is similarly intermittent like hell. ^^ (Or bug 1565809.)
Bug 1555977 Comment 7 Edit History
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Yes that's correct, I saw this problem only with document splitting so far. (comment 2) My subjective perception in the past was that document splitting felt a bit heavier on this Macbook than without. But things have improved, too! I've put bug 1568684 into "See Also" as it's the only other "urlbar border is somewhat corrupt" bug. If I don't see this the next two weeks it will be closed as WFM. Please only be worried about bug 1538540 at this point which is similarly intermittent like hell. ^^ (Or bug 1565809.)