I have encountered recently that the plotting pane can take up a lot of RAM, when I generate many Plots (nothing too crazy, maybe 50, but then Julia + Atom need 3 GB of RAM). It gets to the point where Atom and Julia are significantly slowed down and I needed to restart both applications, until I realized that pressing on “forgot all plots” clears the cache.
It seems to me, that this is a recent problem, because I do not remember having this problem before. I use Julia 1.2 with Atom 1.41 and most recent stable packages for everything. I plot via