First things first:
Carbonite has one map and it is either maximized (large, like Blizzards World Map) or minimized (minimap sized but NOT the minimap). Blizzard gives us three maps: The Minimap (found in the upper right corner of your screen), the World Map (the big map) and the Zone (sometimes referred to as the Battleground) Map. A technicality, to be sure, but it occasionally helps to use the correct terms when explaining something.
Is your Carbonite installation up to date? Latest
Live Version is 5.059 while the latest
BETA Version is 5.1.0.2.
There also used to be a conflict between Carbonite and Blizzards Battleground Map (the one you open with "shift + M" by default) which caused a frame rate plummet. If you have that map open, try closing it and see if your FPS come back up.
One other thing: Unless you are running Carbonite as your only addon (and I mean
ONLY addon), the only way to really tell if Carbonite is causing the issue is to test by
disabling (
NOT deleting)
all of your addons EXCEPT Carbonite. If the problem continues, then the problem is being caused by Carbonite. If it does not continue with Carbonite as the
ONLY enabled addon, then there is a conflict between Carbonite and another addon.