PKR is a very power-hungry software and I can only recommend using it if you have a decent (that means good) PC with more than 1GB RAM. I tried to run it a few months ago with 768MB and it wouldn"t run!
I agree, I don"t even attempt using it on my small laptop. I"ve played it a few times on my desktop, but the flashiness soon gets tiresome, and I switched it back to the "standard" top down view pretty quickly... But I have read various things saying it is pretty soft so I may have to have another look... I remember having issues with it being very slow and with disconnects, and that was running with 2GB and a pretty fast connection, but things may have improved in recent months.
There is some kind of "reduced mode" that installs with it that I think cuts down the minimum system requirements, which may be of use on less powerful systems, haven"t tried it so can"t comment on whether it works or not...