I THINK, it is because I am dropping all of them at once. the b-52 I hope wont lag so hard
Okay I see what is wrong now, I had to reinstall Windows 10 (after a Microsoft update destroyed my NVME drivers), and of course reinstall RF-X as well, in RF-X I went to the system editor (control/alt/tilde) and typed "physics_threaded 2" enter and returned to main screen thinking that command would be saved, but no, it does not get saved you have to enter that command every time RF-X restarts, so consequentially my next restart was after I downloaded your excellent F-105D, running the F-105D without physics threaded, really upsets RF-X, Adrenoline 60 prompted me to look at the RF-X config files (RF-X.cfg) and change the physics threaded from 0 to a 2, RF-X now starts every time with that command applied and the F-105D performs great (no stutters).
The Lancaster Night Bomber also had a very severe stutter on bomb release, sometimes would drop to only 3 fps, (slow motion slide show with the staggered release ) but now that is also a lot better, fps do not go below 70 fps.
Is it just bomb release problems, NO, I have another model (RAF SE5a Scout) that stutters severely just rolling down the runway (non-threaded) in the air it is great, but threaded applied it performs perfect, ground and air.
Moral to the story, Knifeedge should apply this physics threaded command to the permanently cfg file.
Again thank you Legoman for all your help, and a big thank you for creating these fantastic models.