Last modified: 2014-04-15 06:22:17 UTC
Tracking bug mainly for issues involving multiple "querypage" special pages at the same time, e.g. from a user interface or performance perspective. Performance affects the usage of such special pages on Wikimedia projects but is not the only reason (see e.g. bug 15434), still I think MediaWiki is the best product for this tracking bug.
Adding Roan in cc as he mentioned some querypage work in bug 12942 comment 7 so he surely knows more.
I'm not sure if bug 4204 and bug 39667 are related to this bug, but they might be.