70649 2011-10-21 14:16:07 -0700 [MutationObservers] Implement constant-time lookup of observers 2012-02-09 15:26:42 -0800 1 1 1 Unclassified WebKit DOM 528+ (Nightly build) Unspecified Unspecified NEW P2 Normal --- 67686 1 rafaelw webkit-unassigned adamk darin dglazkov rniwa sam oldest_to_newest 488652 0 rafaelw 2011-10-21 14:16:07 -0700 If all observers are registered at the document-level (and the document stores this information), we can avoid having to walk up the tree to look for observers. This is likely to be a common case and worth fast-path-ing. 553567 1 adamk 2012-02-09 15:26:42 -0800 Remove as a blocking bug; we've got this in mind as a performance optimization once we've seen more of the usecases of MutationObservers in the wild.