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Recommended System Specifications
While we don't have a strict set of minimum system requirements, we recommend at least the following...
I installed it on a 27" imac 2010, worked great
I would not upgrade, if it ant broke don't fix it.
sudo apt-get purge elementary-desktop
sudo apt-add-repository ppa:elementary-os/testing
sudo apt-get update
use this command to see what is the reason for your slow boot time
I would be looking at the health of your SSD, I had the same problem some time ago and it was mt SSD failing. The SSD was 1 week old.
I installed it on a 2011 27" imac. It worked very well.
Have you tried uninstalling the printer and re install using the new package?