[Admins]

Automapping can eventually make walking slower, but if you are not watching the map or walk around then the automapping should not have any impact on the frame rate. When automapping is enabled it holds some more textures in texture memory, which shouldn't be a problem except the gfx driver is really bad (and doesn't swap out the textures if they are not in use).
Text is one of the slowest things on v2, because it is using the true type font rendering engine of Windows which is looking nice but is slow. You can eventually limit the length of nicknames in the options to speed that up. On a 2.8 GHz computer that shouldn't be necessary though, normally.