sharethis.com and web site performance

I started using the sharethis.com service a while ago. And, as much as I think it's neat, it really (I mean, really!) makes the site slow down noticeably. For now, I have changed my Drupal modules to not show the sharethis.com buttons on the front page (or any "teaser") page. Instead, they have a prominent place when you view an individual article. This is a reasonable compromise I think.