I'm not running out of memory, how could I if there's no scenery? We've discussed this before and my conclusion was that the available memory reported by SMP on a Mac is nothing like the real available memory (I know you disagree). Anyway, if I switch to XP10, with loads of scenery an plugins, everything runs smotthly with very acceptable FPS. Also, if you look at my first picture you'l notice that XP11 was running at 20 FPS, which confirms that there is no lack of memory.
Is it possible that in a reinstal something is used from a previous version or is everything erased? I could try to erase everything manaully and do a fresh instal, instead of the reinstal. I'm not sure if that counts against my activation slots, which are probably running very low.