While I wouldn't disagree that an OSX install can get slower over several years, I can't help but think what you want is a bit of a case of 'the grass is always

While I wouldn't disagree that an OSX install can get slower over several years, I can't help but think what you want is a bit of a case of 'the grass is always greener'. There are plenty of lean linux distributions out there, but the reality is that they cut things out. Modern operating systems do a lot to improve your experience as a user and provide various services. A lot of tech people seem to want their system to have as much CPU and RAM free as possible, but then what are you going to do with it? Are your apps actually running out of memory and swapping?