Hi telferg
One of the reasons for New-TFM, over the old TFM, is that the ancient java structure of Il2 means that it was never really designed to use the massive amount of RAM and Graphics power that we now have available, so even on a Super-Rig Il2 its still going to suffer memory leaks and issues associated with a 10 year old sim. I can think of no other 10 year old programs that I still run, except for NASCAR 2K3 (modded to the gills!)
For the tightest performance with content, the original UP3 and DBW have a great deal of material, mostly compressed into SFS format, which loads quickly and is read more efficiently by the sim. The modact (the modified executable) on top of that also has to read un-compressed files from folders in the MOD folder (#DBW or #UP etc). It is when we start stuffing these MOD folders with extra stuff that the damn thing is always going to reach a point where it starts to leak and fart and struggle no matter what rig you are running.
Great hardware may postpone the inevitable, but its still inevitable. We can't get everything compressed instantly but neither can we run an unlimited MOD folder. The more balanced approach, at this stage, are era specific mod-sets like VPmedia's DBW-1916, Poltava's SCW and New-TFM.
Eventually we may hope to see all of these ideas and a new Jetwar compressed to SFS, patched to 4:13 and available through a single selector. That's for the future and in the hands of the really clever people that keep SAS1946.com at the forefront of Il2 modding. Meanwhile I'm happy to make and fly new missions and keep them as up to date as possible.
Until then you can continue to expect FPS issues on huge installs under the most unpredictable circumstances!