Among the new features is defragmentation during startup (i.e. before Windows has started fully, so that files that can be defragmented that normally can't because they are in use).
See Piriform - Defraggler v2.0 Beta.Piriform wrote:This is a Beta version, so we don't recommend it for general usage just yet. We're confident it's bug free, but please only use it on test systems until we release the final build. Don't worry this will be in weeks, not months. :)