Good news Grey - with your framework 4 test things are a lot better.
In both windowed and full screen mode there is no tearing effect whatsoever.
In windowed mode everything is very very smooth.
In full screen mode there still seems just a very small hint of jerkiness with some of the fastest moving UFO sprites, but certainly nowhere near as bad as the first few framework tests. The slower moving UFOs are perfectly smooth though.
Toggling the fix lag and flip values has no impact on performance.
In both windowed and full screen mode there is no tearing effect whatsoever.
In windowed mode everything is very very smooth.
In full screen mode there still seems just a very small hint of jerkiness with some of the fastest moving UFO sprites, but certainly nowhere near as bad as the first few framework tests. The slower moving UFOs are perfectly smooth though.
Toggling the fix lag and flip values has no impact on performance.