I have noticed an increase by maybe 10-15 minutes
Previous Platform: Windows xp home sp3 32 bit
Processor: amd 1.8 Ghz with 2 Gb ram
Current Platform: Vista Ultimate SP1 32 bit
Processor: Intel Core 2 Duo 3.16 Ghz with 4 Gb ram
way to many other variables to attribute my speed gain to just my processor though.