Speeding up you Apple Mail Client (mail.app)

I’ve got tens of thousands of imap and pop3 email messages stored in my Apple Mail client software (mail.app). I really like using Apple Mail, but things were getting unbearably slow as my mail database got bigger and bigger.

I stumbled upon this tip for speeding up Apple Mail and it works beautifully. My Apple Mail is now very snappy with virtually no lag. Sort of makes you wonder why Apple doesn’t just include this functionality in the first place?