Well, I have a Co. laptop, Dell Latitude AMD/Sempron 3600; 1.99GHz and 2Gig of RAM, and I also installed SnT with GPS...
My machine will grind to a halt with any other process running... even a small excel file will lock it up.
Streets is a really bloated program, sad really... a little PDA sized device will outperform a laptop as a GPS mapping system.
