My guess would be fraps, unless people found an .ini tweak to get it to show. The console commands default to chat for some reason, so the "stat fps" command common to Unreal engine games isn't working for me.
This is what i did. I am using the cd version - not steam.
1. Go to the file WillowInput.ini, it should be at: C:\Users\*your name*\Documents\My Games\Borderlands\WillowGame\Config 2. Add the line Bindings=(Name="J",Command="Stat FPS") above the large group of bindings, it should be about line 9. 3. When running the game press j, and the fps will appear in the top right.
Of course it doesnt have to be the 'j' key, but just make sure to use a key which is not already used.