400MB is still a lot IMO.

You obviously know this but for youngest people on HN: Back in the 90ies we could run Autocad on PCs with 512 MB.

It was slow but it was possible.

My Slack app on MacOS has been up for awhile. Current usage is 197+183+132 = 512MB. Much better than before, but still not small.

Mine is 118.8 + 125.6 + 182.5 MB = 426.9 MB after about a day and a half.