zram can be a life safer for older machines. Mine has only 2 GB, and on other distros it made a huge difference in general responsiveness.
it is swapping on a ram disk wich is comprimized so if the ram gets low, it dont have to get written on the slow hdd/ssd.
this need more cpu but is even faster than swapping on the harddrive.
Please take a look at this thread: https://solus-project.com/forums/viewtopic.php?f=14&t=1864