I am on the El Capitan GM public release.
When I open the Mail app, everything slows down to a crawl. I opened Activity Monitor, and showed excessive RAM usage by the Mail app. Anyone else experience this?
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Interesting! I keep trying to have a reason to use the mail app but it's had so many issues over the past few years I've just avoided it. I'd prefer to use it so I could view all my mail in one place but oh well. Maybe someday. For now I have to deal with 3 email client apps and it's a hassle.