Hi @nukecad
No Smart Cleaning enabled.
It appears to grow as large as 20% after several hours.
CCleaner "works sluggishly" when restored from minimized, however this was the same behavior when it was open for a long period of time. It doesn't seem to free up the high CPU utilization until closed. Suggesting a possible memory leak, though memory utilization itself is *not* high which is odd and hopefully not indicative of something else.
I notice a general slowdown in Windows however when I check the task manager, the only program open consuming bandwidth is CCleaner, so the general slowdown I believe is because at 10-20% utilization, Windows is having to divert idle resources to the program that would normally be available for foreground apps.
Hope this helps. Oh and install was directly from your website.