short remark on this: This effect is based on the Twitter part of the plugin. The Sexy Bookmarks plugins tries to fetch a short url for your webpage from a short-url-service. That means, if you have 8 different articles on your frontpage, the plugin tries to get 8 different external contents (the short url) for each article on your frontpage. This will slow down the page speed.

Turn the Twitter part off to improve the page speed. I am working on a higher performance on this side.