My Mail is ridiculously sluggish.Connecting it and Safari to the internet, from a cold start, is unbelievably slow. Like dialup!
However, I've been doing quite a bit of research from all over, and reading some great advice and views on the Apple forums. I've decided that I'm going to wait for the revision, which will surely be soon. I understand, now, that Mavericks is based on a new arcihtecture, so it's not surpring that a few people are experiencing problems from installing it on top of ML. I think the fixes are on their way.
But I really cannot blame everything on third party stuff. Mail, and even Safari are quite happy to misbehave, without an help from other developers, I feel. I've noticed an enormous increase in Safari's hunger for RAM. I was under the impression it was more ecomonic! Thing, most of my system seems fine, and my main app, Logic is running great. It's not the spectacular OS that I was leads to believe. I don't really see that many "improvements" on ML. But this just the start in a new chapter, I guess. Still a great OS.