The fedora 27 images can easily reach 5Gb of use under heavy load, but in gneneral I have pretty good performances and I usually have a couple of throwaway VMs and the main work VM running and dealing with web, co pilations of various sort and editing.
Something that we haven’t seen that we need to see is a greater hardening of the overall kernels of every operating system through things like grsecurity [a set of patches to improve Linux security], but unfortunately there’s a big usability gap between the capabilities that are out there, that are possible, and what is attainable for the average user."
https://theintercept.com/2015/11/12/edward-snowden-explains-...