jumping in water

[Benadiel]

When I hold down spacebar while underwater I expect to move vertically fairly quickly. There is a very small amount of movement, but barely more than enough to keep me buoyant. I also can't break the surface of the water by jumping, but jump works normally on land though.

Did this change? I've been gone a while. I know there were some UI changes, particularly for green. This seems like a framerate issue, but I can't find an option to adjust it.

I'm playing on blue. Windowed. XP compatibility mode 2.