It uses about half a GB of ram when actively running on my system. CPU usage is fine except when I sync an IMAP folder that has over 10k or so messages, at which point it does pin one CPU.

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I noticed I'm running it with "java -Xmx512M" which probably explains the half-GB of ram usage. It's possible that if I increased that value it would perform better with large folders, but I keep my inbox fairly reasonable and I don't care if the other folders take a bit of time to sync.

Thanks. I am not going to use 500 MB of my RAM for this one thing.

You can certainly try running it with a smaller heap, some of the modern java GCs can run at very close to 100% heap utilization.

Also, FWIW, it's the 10th largest item in my top listing, with even Thunderbird using more RAM (850MB). I suspect mutt, offlineimap and davmail would combine to be smaller than TB alone.

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Also consider getting your employer to buy you more RAM? A 32GB SO-DIMM kit from corsair is under $200, so nobody should have to worry about half a gig on their work machine...

accept/reject meeting invites seems to depend on your CalDAV client. It doesn't work well with TB, but works great with Evolution. I haven't dug into what's actually happening because when it didn't work with TB, it was spamming peoples inboxes (e.g. one time it decided to reject every single instance of a recurring meeting that had been going on for years), so I just set the calendar to read-only in TB.