Emulator

What steps will reproduce the problem?

1. Start mp2 and call the map z button
   2.
   3.

What version of the product are you using? On what operating system?
r3540 Vista32

Please provide any additional information below.
All started with 52fps in map screen than after r2662 when Distatation
Alpha was broken than restored and added Disable Distanation Alpha option
fps falls to 38, fps could be restored by reverting the second part of
changes of VertexManager.cpp in r2662

The second slowdown happend in r2870 fps fall from 38 to25-26 in the map
screen and about -3-6fps overall
The last slowdown happend in r3397 from 26 to 14 fps but i've port this
commit to 2661 and evrything was just fine, non a single fps drop, it
seems r3397 commite accelerate one of the previous bugs