What happened past CCleaner 5.43 that it now takes 4-6 seconds before I press the CLEAN button? I tried on 16 different rigs with different hardware, although all were running Windows 10 (from 14393 to 17763). The company had to dump CCleaner like some spyware because of that lag/delay. It didn't matter which edition (free or pro) or whether CCEnhancer with trim was used. The startup lag was so annoying that CCleaner lost ALL value to the company employees (unanimous AGAINST vote). CCleaner was meant for a quick clean up, but instead we had to wait those 4-6 seconds of the app being unresponsive before the clean up could take place and often the cleanup itself would last up to 10 seconds.
Version 5.43 loads in 0.5-1 second + cleans everything up (with or without trimmed CCEnhancer list) in another 0.5-1 seconds. All in all, everything is gone in 2 seconds tops.
Version 5.51 loads in 4-6 seconds + cleans everything up (with or without trimmed CCEnhancer list) in another 4-10 seconds. All in all = garbage.
