Some animations, like oblivion gates, waterfalls and fireball spells, have suddenly (after 330 hrs) gotten jerky, even though FPS is still around 60. Tried reloading a save and rebooting the computer. I have a lot of mods that I can post, as well as my PC's specs, if either will help.

I forget what it's called but it's an issue that will happen in any Oblivion save once you play long enough. Use this to fix it: http://oblivion.nexusmods.com/mods/5127