I have been trialing perfectdisk 10 and i wonder if people still think it is best. Out of all the defragmenters i have tried, it is by far the slowest. The estimated time just rises by hours. It has one of the slowest analysis i have ever seen as well. It seems the developers are lowering resource usage as much as possible and it isn't good if it makes the speed drop significantly. I defragmented with O&O just before and it lowered fragmentation to 0.1% which perfectdisk also reports. At first i thought the new throttling was slowing it down, but even after disabling it, perfectdisk took forever (it hasn't even finished one run yet!). I like the information and stats it provides, but its pointless to keep it just to benchmark other defraggers.