2.7 quite snappier....even on Core 2 Duos.... I've deployed 3.0 at one client...I did an all new network at the law firm this past December. Brand spanking new high end business machines. Complaints of slowness...one by one I uninstalled 3.0 and installed 2.7...clients instantly much happier...said PCs were faster without even knowing what I did. I could clearly see the difference also. I've tried it several times myself on several different rigs that I have over the past 6 months or so...keep finding myself going back to trusty 2.7.