When you want the Aquarium to send its frames to the graphics card when it is ready, not before and not after.
This will prevent "juddering" or "tearing" for lack of better of word when the camera is moving as the viewport is showing before-and-after updates of the screen.
"Journalism is printing what someone else does not want printed. Everything else is public relations." - George Orwell
"If voting changed anything, they'd make it illegal." - Emma Goldman
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