OK, so I had a not-so-great night running Ubuntu 10.04 Lucid Lynx — in release-candidate stage at this writing — and wondered what exactly made things so sluggish during a 2+ hour production session hacking away at Dailynews.com. Was it Firefox 3.6.x swallowing CPU and memory? All the social-networking and cloud-integration stuff running in the background? Xorg issues (which come and go with every kernel and Xorg update)? At this point I really don't know.