The Tweakguides for Oblivion will help immensely:
http://www.tweakguides.com/Oblivion_1.html
There's also some really awesome mods out there that tweak the textures, meshes, and whatnot, so that game still looks bad ass, but runs much smoother. I would also recommend Game Booster, which temporarily shuts down unnecessary system programs while you're playing.
And, as other people have mentioned, get OldBlivion if you really need to squeak out more performance.
Best of Luck.
http://www.tweakguides.com/Oblivion_1.html
There's also some really awesome mods out there that tweak the textures, meshes, and whatnot, so that game still looks bad ass, but runs much smoother. I would also recommend Game Booster, which temporarily shuts down unnecessary system programs while you're playing.
And, as other people have mentioned, get OldBlivion if you really need to squeak out more performance.
Best of Luck.