I recently had to re-install some twitter/tumblr syndication modules on a few small sites. Reason: sudden performance issues. The sites were medium-sized, and depended heavily on externally syndicated content. You’ve seen these busy sidebars before: a few recent twitter posts, a few more tumblr pics, another FeedBurner, maybe a dozen of Disqus/Echo comments, Amazon widget. This is all good, and wonderful, to spread your content/community around on multiple platforms, and syndicate them on your site. But keep in mind that all these services – while practical and very responsive – are relatively new technologies. Young start-up companies.