*** Font Lock support modes
Font Lock can be configured to use Fast Lock mode and Lazy Lock mode (see below) in a flexible way. Rather than adding the appropriate function to the hook font-lock-mode-hook, you can use the new variable font-lock-support-mode to control which modes have Fast Lock mode or Lazy Lock mode turned on when Font Lock mode is enabled.

For example, to use Fast Lock mode when Font Lock mode is turned on, put:

(setq font-lock-support-mode 'fast-lock-mode)

in your ~/.emacs.