So I ran two mission tests last night.
1. Using our Persian Gulf Map I removed all the DML scripts but left the Phantom in. I turned on my frames so I could monitor. I have my frames capped at 60 in my settings (I read a while back that this was the right thing to do?). I used the phantom for bombing practice using high drag and clusters (first time I had used them, they make a nice mess of the hostage town ).
My frames stayed pretty much solid at 60. There was the odd dip (flying low over a big town but that was to be expected) but nothing serious enough to cause a freeze or lock up.
2. Using our Persian Gulf map I removed the Phantom and put back all the DML. I used the Apache this time and again kept an eye on the frames. They stayed pretty much the same as before, most of the time at 60 with the odd dip. Loading into the Apache was a little slow for all the graphics to render (and possibly the DML spawns which I know there may be a problem with at the moment. cfrag is aware and planning to release a fix this weekend. Once he does I will update the mission with the new scripts) and there was the odd stutter while this was taking place, but we have had they before anyway. Once everything had rendered ok I had not problems flying around, putting it into a solid hover or putting warheads on foreheads.
Outcome of my test on my own on the server: INCONCLUSIVE.
(Unless something has changed in the background of course and we are back to original performance.) I have put the full Persian Gulf map back up (Phantom and DML) so lets see how that goes.