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#3907 closed bug (wontfix)

Opened January 18, 2009 01:33PM UTC

Closed January 20, 2009 08:11PM UTC

poor performance in jquery-1.3 comparing to jquery-1.2.6

Reported by: bagwg1127 Owned by: john
Priority: major Milestone: 1.3.1
Component: selector Version: 1.3
Keywords: filter, selector Cc: bagwg1127
Blocked by: Blocking:

construct ul:4129

$(">ul>li", "body"):4

filter expend:4

construct ul:4149

$(">ul>li", "body"):40

filter expend:399

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Change History (1)

Changed January 20, 2009 08:11PM UTC by john comment:1

resolution: → wontfix
status: newclosed

Yep, this is known. Some selectors in 1.3 are slower, some are faster. In the case of your example you have the benefit of a single root element - which helps to speed up 1.2.6-style selector engines, but doesn't benefit 1.3 (which must look at all li elements then traverse their way back up. The more you're able to filter down on the initial query the faster it will be.

A couple changes: Remove the root of body (going against a root of document is faster). Why the initial > check in front of the ul? Removing that can speed things up as well.

I'm marking this as wontfix since this is mostly by the design of the engine.