Several years ago CCleaner was having a problem with taking a long time, several minutes or more, to complete a "run", or on occasion it would not complete the run at all.
Usually this just takes a matter of seconds.
The same thing started happening in the latest 2 versions of CCleaner. It does complete the run, but takes far to long.
Probably your mapped drives. Unmap them and try. I make links to what I want on the network in "Favorites" (left pane Windows Explorer, Win7) instead.
I searched out the original thread I participated in on this subject back in October of 2014
Long task cycles - CCleaner Bug Reporting - Piriform Community Forums
It took quite a while after that before the problem was solved. It had nothing to do with my system. It got ironed out in a future version, but not acknowledged as far as I know.
I'm not on a network. No mapped drives. No antivirus, Windows Defender only.
I use a portable version of CCleaner. The problem began immediately after I updated to the version before the current one. Everything was fine before that. I'm familiar with the symptoms. I recognized it right away.
I just reverted back to CCleaner 5.53.7034. "Run Cleaner" has now returned to normal.
Task cycles that took up to one minute with the latest CCleaner versions now only take a few seconds.
So as before in 2014, it has nothing to do with a problem in my system or setup.
Has nobody but me has experienced what I described?
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Windows 10 Pro, Firefox 60 rc3