Bug Tracker

Opened 7 years ago

Closed 7 years ago

#3907 closed bug (wontfix)

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:

Description

http://www.finereport.com/jquerytest/jquery-1.2.6.html

construct ul:4129 $(">ul>li", "body"):4 filter expend:4

http://www.finereport.com/jquerytest/jquery-1.3.html

construct ul:4149 $(">ul>li", "body"):40 filter expend:399

Change History (1)

comment:1 Changed 7 years ago by john

  • Resolution set to wontfix
  • Status changed from new to closed

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.

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