I think you'll find that SR4 - as in SR4.0 - was the one with the negative feedback. For me SR4 was slower than any other P5 release. SR4.1 however works, and is as fast or faster - in terms of responsiveness (with Content Parasite removed of course) than any prior version of P5. I'm still no P5 fan or user, prefering PPP for it's responsiveness, but I'd still choose SR4.1 than any other P5 edition - and I've tried them all. Only way I can see they could speed up the response time of SR4.1 (to P4 equivalent) would be to put the Paramter Dial back on the main Poser UI panel where it belongs, avoiding the Windows inter-task communication overhead, but I doubt that'll ever happen. (Dunno what was up with SR4, felt like there was something wrong with its build, like a bit of diagnostic code still compiled in or something.)