People, beware of this extremely slow application. Yesterday I used "WhatChanged Portable" to make comparison of 2 snapshots of my system (Intel(R) Core(TM) i5-6300U CPU @ 2.40GHz, 8GB RAM, Win10x64), nearly 900k files on C:\. It started 23.12.2021 at 14:34:55 and finished 24.12.2021 at 02:52:44. I was so confused with this unbelievable slow program! Today I did the same comparison task with "Regshot Portable" and it took nearly 8 minutes for the same job. So, you are warned.