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Ticket #8437 (closed bug: wontfix)

Opened 3 years ago

Last modified 2 years ago

Using Multiple Selectors to search by tag name is significantly slower since 1.4.3

Reported by: jseger@… Owned by: jseger@…
Priority: undecided Milestone: 1.next
Component: selector Version: 1.4.3
Keywords: Cc:
Blocking: Blocked by:

Description

Starting in jQuery 1.4.3, finding elements using multiple selectors and tag names is dramatically slower (10-30x slower). For example .('input,select') now takes much longer.

See performance tests at:  http://jsperf.com/jquery-selector-performance-problems

Change History

comment:1 Changed 3 years ago by rwaldron

  • Owner set to jseger@…
  • Status changed from new to pending
  • Component changed from unfiled to selector

I'm getting different results with a perf test that we've used on other recent dom traversal/manipulation...

 http://jsperf.com/multiple-tag-selector

comment:2 Changed 3 years ago by jseger@…

  • Status changed from pending to new

Interesting, it seems to perform fine in your test when searching for divs/spans, but it's still slow searching for inputs/selects.

In this version, I took your test, increased the count from 500 to 1000 (to help emphasis the slowness), and repeated all of your tests but searched from 'input,select' instead of 'div,span'.

 http://jsperf.com/multiple-tag-selector/2

comment:3 Changed 3 years ago by rwaldron

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

In 1.4.3, Sizzle began branching as much selector work to querySelectorAll, which results in less work and overall higher performance.

Please follow the  bug reporting guidlines and use  jsFiddle when providing test cases and demonstrations instead of pasting the code in the ticket.

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