Latest Inferno CVS builds (both the optimized and un-optimized) are experiencing terrible slowdowns at any larger effects: Beams, beamglows, flak, subspace vortices, fire effect... little things like that. They are unplayable at least on this PC. Tried both optimized and unoptimized version... the unoptimized worked slightly better.
I would estimate that it is specifically large DDS textures that, for some reason, are not being nice to the latest Inferno builds. Reason to this I can only guess, but that would seem to be the thing.

I'd just like to know if the 3.6.9 branch Inferno builds have the same problem, or if this is at all related to
Very Bad FPS problem, or even exactly the same thing. If this is a problem existing in latest CVS builds, could someone please add an Inferno build of the latest 3.6.9 RC build into corresponding topic? It would make actually playing ItDOH#4 possible; now I have to edit the table file and move ships up and down in the table according to what ships are needed in next misson. It kinda breaks the continuity...

By the way, speaking of P4 optimized builds.
Even though I do have an Athlon64 CPU, would I really profit from P4 optimization? I'm running a 32bit Windows version, so wouldn't the program work in 32bit mode regardless of the processor - or does the FS2_Open executable have ability to override the 32bit OS and use 64bit properties of the processor?
I would think not, but I'd like to be sure about this.