Even after the Mavericks Mac Mail update and showing my "All Mail" folder, Mail.app is still acting weird and slow. Any further suggestions?

Question

Even with the recent Mac Mail Mavericks update and showing my "All Mail" Gmail folder, Mail.app is still acting funky and slow.  Any further suggestions for getting Mail.app back to it's pre-Mavericks state?

Answer 1

Your description of the problem is rather vague, but I'll take a guess at what you mean.
Quit Mail if it's running. Back up all data.
Triple-click anywhere in the line below on this page to select it:
sqlite3 L*/C*/*.mail/*/L*/*/*/C*.db vacuum; sqlite3 L*/M*/*/*/E*ex vacuum
Copy the selected text to the Clipboard by pressing the key combination command-C.
Launch the Terminal application in any of the following ways:
☞ Enter the first few letters of its name into a Spotlight search. Select it in the results (it should be at the top.)
☞ In the Finder, select Go ▹ Utilities from the menu bar, or press the key combination shift-command-U. The application is in the folder that opens.
☞ Open LaunchPad. Click Utilities, then Terminal in the icon grid.
Paste into the Terminal window (command-V).
You should see a new line ending in a dollar sign (“$”) appear below what you entered. If not, press return. You can then quit Terminal and relaunch Mail. Test.
Note: This procedure will have no effect unless you quit Mail when you begin.