For some reason, my game slows down massively at the sight of an Oblivion Gate. So I was wondering if someone could either make a low quality one, or replace all Oblivion Gates with a different gate, as long as it functioned the same, and as long as it still came up with 'A Gate to Oblivion' on the map. Also, it has to be recognizable, so I don't just want a trap door or something, it has to be some sort of portal you can see from the distance. I also want the Oblivion Gate to be inside Oblivion as well. Could anyone help with that?

This may help if you're down with changing the oblivion.ini file in Documents\My Games

bUseRefractionShader -- Disable to remove most of the particle effects for Oblivion Gates and summoned creatures. Almost mandatory on pre x800/nv58xx series cards if AA is in use.

Read here first- http://www.uesp.net/wiki/Oblivion:Ini_Settings

there's a ton of performance enhancing mods and console commands for oblivion that I currently use. i can post more here if you're interested, but, not sure an really apply to the gates