After upgrading the OS on my 2008 MacBook Pro, it was struggling with today’s performance needs. The constant disk swapping because of insufficient RAM (2GB!) made the machine pretty unworkable; starting up or opening an app took several minutes, and for every mouse click or window switch there was a 20-30 freeze. Combining this with the fact that it did not have a battery nor a working DVD drive anymore, it unfortunately needed to be retired as my primary laptop. After some consideration, I decided to go for a brand spanking new Windows 10 machine instead, which can run everything robot that I used on my Mac. (Still no regrets after a couple of weeks of running with it).
Disclaimer: I kindly remind you that I am not sponsored by any hardware or software vendor, and that this post should not be interpreted as a recommendation of one choice over the other.