Most of this comes from overhead in Chromium, which currently (the version used by Ivelope) suffers from a few bugs which increases memory usage. I think this will drastically go down as time progresses and new updates of Chromium becomes available
As a past (very minor) contributor to chromium+webkit I'm curious if there's anything one can do to help, but I haven't kept up with their status in a long time.
It's a 10 year old project and memory usage has always been fairly high, I don't see any indication of a major focus on reducing it anytime soon.
I don't hate Electron apps or anything, but the ones I already have open are using up enough of my memory that there isn't much left to run more of them. I really do hope this improves in the future though. If not I may just have to buy more RAM.