Apple mail running slow help?

Question

apple mail running slow. Delayed typing etc. all esle on computer OK.
OS 10.8.4
Macbook air 1.8 GHz Intel core i7  4 gigs ram

Answer 1

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*/*/*/*.db vacuum
Copy the selected text to the Clipboard (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.