Often the best performances on player's profile are not actually the best performances the player has had. Players should be able to choose and display what they think are their greatest achievements. Either some new tab should be added, where these chosen performances are showed off (like some sort of trophies collection). Or the best performances list should be replaced with a user chosen list, and then the maps that give the most pp should have a list of their own. People could possibly abuse this by choosing really stupid stuff, but that shouldn't be a big problem 