If CC means Ccleaner, that doesn't block anything.
No, my post seems to be a technical non sequitur, but when I catch the click word blinking bottom left, and everything grinds to snail's pace, I run CC and all's well for a while.
I can't fathom out what's happening, or even if it's just a coincidence, but it's worked perhaps a dozen times. I'd sooner have a proper fix for whatever's going on, because I'm concerned I may spend a lot of time in an intermediate state of slowness. Seems a bit that way these days, a disappointment for a new OS install. ( W7 Home Premium. FF 3 6 13 )