I’ve been managing to keep an ageing 2012 Mac Pro as my main computer for nearly 7 years now, and from time to time its really been a struggle. Over the years I’ve added various upgrades and replacement parts, and its somehow managed to keep going, despite getting a tremendous amount of use. Lately though it’s been driving me mad. It takes nearly an hour to reboot - from off to being useable. The OS comes up in about two minutes, but by the time everything loads and settles down and is useable - it’s nearly an hour. This is partly because of a slow system drive, and partly due to years of bits and pieces clogging the OS