it could be that you need to defrag your system. you could also check to see what other programs are running that may be excessively using the harddisk or cpu.

i havent checked out the 1.5.0_05 java version yet, i might do that later on. (i havent heard anything about it) this could be the problem.

if thats not the case, maybe you can check out the beta forum and run a stack trace for us.