I\'m using rails Version 3.0.3 and ruby Version 1.9.2p136 (2010-12-15) on a Intel Core 2 Duo 2,6 Ghz with 4 GB Ram and Windows Vista Business SP2 with no other (heavy) appli
For a speedup you could try my loader speeder upper (helps rails run faster in Windows): https://github.com/rdp/faster_require
Also checkout spork, which works in Windows, and jruby also works well.