I've been running 10.5.2 r2 since it's release and i find that it's very slow. Applications are slow to respond, etc. I'm running this on the same machine I've run 10.4.8, 10.4.9 and 10.4.10 on. My system specs are AMD Athlon 64 4000+ running on a NF4SK8AA mobo w/ 1 gb of RAM , an WD 80gb IDE HD and a Pioneer 110 DVDR. I'm not sure what causes the performance hit but it is quite noticeable. Anyone have any ideas? BTW: The only thing extra i've installed is Diabolik's x1300 kext to get my ATi x1300 working w/ QE/CI.