Mart....
I know that I have mentioned to you about the cowardly type of behaviour of some of the creatures, and attached a vid for you to see, but now I am thinking that I might have another issue with RC2 that I did not notice in the previous build.
First my PC spec
Intel E8500 ran at 4Ghz
4GB DDR2 memory ran at 1000mhz
ATI 4870 ran slightly over stock speed
22" TFT ran at 1680x1050
Win 7 RC 1 x64
Running the Vanilla game (1.5 patch) or with the following mods, which could impact on the games performance...
NMC texture packs
Fellout full
... the game runs absolutely flawlessly with no lag at all, I do not bother with any AA or AF in the game and the detail is set high.
However I have found that at times when using RC2 I am getting quite severe slowdowns (but this is not consistent), lag and even crashes. The crashes seem to apply when I notice the lag and continue to play and interact rather than just pause and let the system "catch" up with what it needs to do. For me it is so very very rare that I ever have a crash with Fallout 3 and that rarity has increased greatly since the 1.5 patch.
An example...
I went to Fort Independence and travelled from there into the Wasteland. I saw way ahead, before they appeared as red blips on my compass, about five or six raiders. I crept within shooting distance and using my sniper rifle I started picking them off as they approached, I killed about 3. When I was seen, and they started to fire back, the game slowed down greatly and the framerate dropped to such a level that it was almost unplayable.
Having saved the game when I was just outside of Fort Independence I then exited and removed the NMC textures and Fellout completely. Tried again and the result was the same. As the two or three raiders then approached me I found that the game was becoming less and less responsive.
So I then exited the game and removed the MMM mod., as it was installed by the FOMM it was easy to do.
I installed the NMC textures and also Fellout.
I then loaded my game but went into my Megaton home and waited until the fifth day and then went back to the fort. I found the same group of raiders, but only two, and then approached them with my sniper rifle in my usual crouched position. This time I let them notice me so they would run towards me, both shooting. The game remained very responsive and there were zero slowdowns.
I reinstalled MMM and the same slow downs at the same location applied (I waited in my Megaton home again until the 5th day).
I have played with your previous build enough to understand the differences between having Increased Spawns (IS), or Increased Increased Spawns and or Feral Ghoul Rampage (FGR) and their performance implications on my system. The only reason that I stopped using the FGR with IS was due to me not being a good enough player to cope with the increase in Ghouls coupled with my style of playing and nothing to do with any performance implications with my system. In fact I did not notice any performance issues when I did have it on.
I am doing some more testing and I might find some other cause to the performance issues. Sadly I deleted your previous build so I can no longer go back to that one. I will keep you informed as to what I find.
FWIW this is my load order...
Fallout3.esm
Anchorage.esm
ThePitt.esm
BrokenSteel.esm
TossedMines.esp
UrgeSpringvaleHome.esp
RRR+ANCH+PITT+BS 1.0.esp
SniperZooming.esp
choose_XP_FOSE.esp
weight 30.esp
Slower Degradation (-80%).esp
BetterHeadshots.esp
Fellout-Full.esp
Fellout-Anchorage.esp
Fellout-BrokenSteel.esp
DK_BulletTime.esp
DarNifiedUIF3.esp
DUIF3Extras.esp
when using the MMM mod I would have...
Mart's Mutant Mod.esm
Mart's Mutant Mod - Increased Spawns.esp
Mart's Mutant Mod - Hunting & Looting.esp
Mart's Mutant Mod - Natural Selection.esp
Mart's Mutant Mod - Tougher Traders.esp
Mart's Mutant Mod - Broken Steel.esp
EDIT :
Before I posted the above I thought that I would install the MMM mod again, after removing it for the second time. I then waited until the 5th day in my Megaton home and then fast travelled to the same location. I noted the increased amount of raiders, reflecting the IS (Increased spawns) aspect of your mod working, and this time it has just played through that section flawlessly....!!!! Now whether that just makes everything that I have written above a wate of time I don't know but this isn't the first time since using the RC 2 mod I've noticed similar types of slowdowns that I hadn't in your previous build but it does appear that it is not consistent.
Sorry for the long drawn out post