Piriform's Defraggler

I am a contributor to Defraggler and Ccleaner so these comments
are intended to be constructive.
Running Windows 8 upgrade on a HP Pavilion 64-bit.
I do regular maintenance and have no viruses.
Defraggler is running very slow.
When the defragmented files reach zero and the percent is,
lets say 60%, it continues to run until 100%. Why??
The time remaining might as well not be there as it's so inaccurate.

 

I suspect that when products have a progress amount it is based on the number of operations it will perform. For a defragger it may be a percentage based on the total number of files, but not all files will be the same size. A single file of 4GB would only count as one file but would take longer to defrag than a file of 32KB.

 

I guess it might be consolidating the free space. Lot of defragmenters work in two passes - first they defragment the files, then they consolidate the free space. Advanced defragmenters do both operations in a single pass.

It's quite difficult to accurately estimate the remaining time for a defragmenting operation, so it's expected.

 

Defraggler is slow in windows 8. Even the simple file defrag with no consolidation is slower than when I used it in vista in the same hardware.