This has been my experience as well. I do a lot of work on a computer running 18.04 with an i5-5300U (2 core, 4 thread), and the change between having an SSD in

This has been my experience as well. I do a lot of work on a computer running 18.04 with an i5-5300U (2 core, 4 thread), and the change between having an SSD instead of an HDD was probably the single largest performance improvement I've had because of a component change.