They actually just fixed that in 4.0: https://slackhq.com/introducing-a-more-efficient-slack-deskt...
I'm currently sitting at 400MB total usage (including helpers) for 4 workspaces.
I'm currently sitting at 400MB total usage (including helpers) for 4 workspaces.
Fantastical, a calendaring app, is sitting at 333MB.
1Password is taking up 168MB in the background.
Finder, which I don't even have a window open for, is eating 127MB.
I'm not saying 400MB is amazing or anything, but it's a significant drop from the gigs of memory wasted by previous versions.
Using the browser based version often is less resource intensive.