Apple Mail app very slow since last update
Has anyone else noticed a problem with Apple Mail since the latest update of 7th November?
I upgraded to Mavericks, and Mail was fine. But then I installed the separate upgrade that was offered to Mail, which was announced as being something to do with making it more Gmail-friendly, and ever since my messages have been noticeably much more slow to open.
I double-click on a message to read it and the message window opens immediately, but the content part of it now remains blank for a few seconds before it appears.
I've tried using Time Machine to go back to what I had before the upgrade, but OS X won't let me do that.
MacBook Pro (15-inch Mid 2010), OS X Mavericks (10.9)