Whenever org-bullets is enabled, scrolling (and even fast typing) becomes laggy.

I'm running GNU Emacs 24.5.1 (x86_64-apple-darwin13.4.0, NS apple-appkit-1265.21) of 2015-04-10 on builder10-9.porkrind.org.

If there is a way I can provide more information (e.g. my about my system, config), please let me know.

This is inside the GUI version of Emacs. Note that there is no lag when using a terminal.