Many users have voiced worries about Vista’s resource requirements and overall system speed compared to XP. Researchers at Devil Mountain Software, a Florida-based developer of performance management tools, have posted data from their most recent Windows performance tests -- and Vista, even after it's been upgraded to the new Service Pack 1 beta package and 2GB  RAM, is shown to be a laggard. The researches compared Vista, Vista SP1 beta, XP SP2 and XP SP3 beta. In all the tests XP  (SP2 and SP3) out performed Windows Vista by a margin of 2X. The tests were performed on Dell XPS M1710 with 2GHz Core 2 Duo, 1GB RAM and NVIDIA GeForce Go 7900GS graphics card using OfficeBench software. The researches said on exo.blog where they have posted the results of the tests “Of course, none of this bodes well for Vista, which is now more than 2x slower than the most current builds of its older sibling and if you've been disappointed with the performance of Windows Vista to date, get used to it. SP1 is simply not the panacea that many predicted. In the end, it's Vista's architecture - not a lack of tuning or bug fixes - that makes it perform so poorly on systems that were "barn-burners" under Windows XP.” So in short if you thought Vista was an upgrade to XP you were wrong.