Additional note since I had a chance to check my third computer. It's a Server 2003 with AC (P4 2.4Gz 1Gb(ram) with GeForce 7800 GS 256Mb). And the problem is just like the other 2 computers with XP and Vista.
What's interesting is that it is a consistant 40% drop with RadarAddOn .. no matter what other Decal is activated .. or ALL NOT activated .. and what OS it's running on. If RadarAddOn is activated, a 40% drop occurs on all 3 of my computers.
It did not matter the version, 1.00, 1.2.0.11, or 1.2.0.12 of RadarAddOn.
I could not find ANY connection to the MiniMap and the framerate lost .. NONE.
BTW .. I was thinking it was cause by the HUDs .. I'll take that back. It is NOT.

(Not the 40% part.)
All Decal utilities have "some" impact to the framerate. The more utilities you run, the more impact. Nothing new there. And the impact from RadarAddOn was liveable till I notice how much. It explained some bumpyness I had experiance in some places.
Question: Will AC+ run without RadarAddOn? What functionality is lost with AC+ when RadarAddOn is not in the background for support?
And again .. THANKS for the support of our questions!!