OK, this is awful for me, what are other people seeing?
Just updated my DVI800 TiBook to 10.2.3. It looks like VBL sync is busted now. Dragging any window around on the screen results in some noticable tearing that didn't happen in 10.2.2.
(FYI: "VBL" is Vertical BLanking, the interval between display updates. The Window Manager is supposed to wait for this time to synchonize it's updates, so that animation (or just dragging a window) is smooth. With no VBL sync, part of a window may be drawn on the display in one refresh, and the remainder on the next refresh. This makes a horizontal "tear" appear between the two parts, which, to me, is really distracting.)
User regression (TRY THIS, folks and post your results! I don't know if this only affects TiBooks!):
Launch Address Book. Drag the window horizontally slowly but steadily. Does the window move as one big rectangle, or does it appear to move the top & bottom slightly out of sync? (It's easiest to see if you look at the window edges against a dark desktop background.)
Another method: set your desktop to something dark. Now click on Finder's "File" menu. Rapidly move back and forth between "File" and "Edit".
Developer regression:
Make a double buffered CGL context and request VBL sync. Update your content (horizontal scroll...) at at least 60 fps (or whatever your display refresh rate is.) For me, I get a big tear about every 60 frames. Ugh.
I logged bug #3133382 about this.
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