[ Thanks to An Anonymous Reader for
this link. ]
“While trying to optimize the elementary OS performance, Sergey
Davidoff stumbled upon a project called compcache that creates a
RAM based block device which acts as a swap disk, but is compressed
and stored in memory instead of swap disk (which is slow), allowing
very fast I/O and increasing the amount of memory available before
the system starts swapping to disk. compcache was later re-written
under the name zRam and is now integrated into the Linux
kernel.”