As I'm sure every F12K player knows by now, mirrors exact a large framerate
penalty in the game. What you might not realize is, they cost framerate even
when you are in a view where they are _not visible_! So, if you are
watching a replay, or a race after you retired, and are using the TV or other
external view, try switching to in-cockpit, hit "R" to toggle off the mirrors,
then go to whichever view you prefer. Shoddy programing?