Mac Finder is Slow or Not Responding?
They told me that the preferences files associated with the Finder app could corrupt or break causing Mac Finder to misbehave
I don't undestand. If its usable why is too slow??? how to fix?
iMac Pro
I would first Boot into Recovery (Command R) and from the dropdown menu: Utilities> Disk Utility> run the First Aid on your Macintosh HD. If errors are found and repaired, run again until no errors reported.
Recovery http://support.apple.com/kb/HT4718
After that To get a good look at your System config. for conflicts or issues, you can run this utility http://etrecheck.com
If you need help interpreting the report you can post it here in its entirety in the "Additional Text" box in the toolbar below.