If a program exists called “Decrapifier” — then something is wrong with the system.
Macs just don’t get automatically slowed-down by malware, spyware, spamware, etc.
Bear with me — my wife uses a Windows computer, so I am speaking from experience. Her computer is always getting slower and slower. If it were easy to do, she might reinstall her software every week, just to keep things running smoothly.
I’m not saying this to create a division in the ranks — I’m just asking that if you are considering a new computer, please look at Macs. Be sure to go with an Apple factory refurb — full warranty and you save 15–20%.