Not sure about slack vs discord, but browser Gmail is almost certainly less memory hungry than Outlook. And that’s probably enough of a difference by itself.
replyYou can make a pretty good electron app or one that kinda sucks. Slack is in the latter category.
replyVS Code (or rather VSCodium in my case) is also electron based but it's been relatively snappy in my experience - though I don't use a lot of third party plugins.
replySay what you will about Microsoft but the performance of VS Code is really good.
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