I hate to say it but I'm "happy" I'm not alone. Performance on my machines with the latest betas is VERY bad: - MacPro 3GHz, 16GB RAM, ATI5870, SSD, 2560x1600, 4Mpix - i7 4.2GHz, 12GB RAM, OC ATI5870 Eyefinity6, SSD, 5400x1920, >10Mpix - MacBookPro 2.2GHz, 8 core, 8GB RAM, AMD5970M, 1920x1200, >2Mpix I have HDR + low shadows on because without those two features I prefer XP9 ! I get extra smooth 40-70fps on each system including MacBookPro in extreme settings on XP9. (Also I prefer the look of REX clouds. Of course they're not perfect, sometimes doing weird rolls etc but in general look very real, not just "plausible like" an impressionist painting or simple bunch of flat sprites) On those XP10 betas I get almost slideshow framerate, 12-14fps. CPU load is in best case is 5-10% of my 8 cores on each computer (max 15% with high speed flying). It seems a little funny for me, the developers are talking about the hardware bottlenecks instead of programming efficiency and optimization. I think these days no other game developer would sell unfinished beta application with tons of issues and bugs just because it's Winter Holidays time... But I really wish XP10 all the best! For now XP10 on my systems is usable only for fine screenshots with 4xSSAA. I don't think my hardware is outdated just because one simulation application can't run it smootly. I swichted back to XP9. What a relief, back with very smooth motion with 5 full HD monitors from single PCI 2.0 GPU. regards arti