I tried out the example "Notepad" app in the git repo and it ran at 70MB. Is that good? I don't have any metrics about how much memory a hello world Electron app uses.
Fresh instance of Kate on my desktop uses 27MB, albeit its way more than a dumb text editor. Still, twice native is still in the same order of magnitude, something most naive electron apps fail to accomplish.
I just declared Chrome bankruptcy and switched to Firefox a few weeks ago. CPU rarely goes over 10% on my 2017 MBP. With Chrome it was almost always above 50%.
I swapped when the new FF came out. Was sick of chrome using 3–4gb of memory and bringing my computer to a grinding vault. 3 times the number of tabs in Firefox and I have 0 issues. I recommend FF now.
I used Firefox for a couple of years for the same reason, but the new release broke my keyboard shortcuts and VimFx plugin. Now I use opera and cVim, it's even better. Much faster to start than chrome, shortcuts work, syncing works, vim works, developer tools are great, no bloated background services and square tabs!