Hi everyone,
Anyone who has played with Pending Changes knows that in many circumstances, there were some very perceptable speed problems with the feature on complicated pages (which unfortunately, tend to be the pages that the feature is used on). The devs on the feature (Aaron and Chad) did some investigation, and figured out that we weren't caching as much as we should. This is all documented here:
https://bugzilla.wikimedia.org/show_bug.cgi?id=24124
This change was rolled out on en.wikipedia.org. So, if you hadn't played with Pending Changes in a while because of speed problems, now is a good time to give it another shot. Visit here: http://en.wikipedia.org/wiki/Wikipedia:Pending_changes
...and follow the "Pages with pending edits" and the "All pages on trial" links to find articles to try this out on.
We're not done with the performance work, but this particular fix was pretty critical for the experience.
Rob