Oni died...

Well, I had to get my computer cleared a while ago, and that meant reinstalling my old games, which all worked fine. Then I installed Oni. Everything worked fine, didn't install OpenGL cause it doesnt work on Windows or whatever, and the when I play the game everything is so jerky that the intro thing in the training level where the robot is talking took nearly ten minutes! everything down to the mouses arrow on the menu screen is completely jerky. I've tried uninstalling it and reinstalling it multiple times now, so I don't know what to do. Any suggestions?

Install OpenGL :p And/or upgrade your DirectX version, and make sure your graphics card drivers are up to date too.

I have no problems with OpenGL under Windows, I actually prefer it to DirectX in ePSXe :p There's also a possibility that you ran the game after the reinstallation in a higher resolution than you used to use, so that would also cause a slowdown in it. Maybe try 16bit graphics insteadof 32bit.

Oni's not worth playing, anyway.