Opened 12 years ago

Closed 12 years ago

Last modified 12 years ago

#6670 closed bug (fixed)

Autocomplete very slow in IE for 500+ items

Reported by: jorisdekinder Owned by:
Priority: minor Milestone: 1.9.0
Component: ui.autocomplete Version: 1.8.6
Keywords: Cc:
Blocked by: Blocking:


When loading for example 500 items into the Autocomplete widget, setting minLength to 0 and just pressing the down key, the items are shown in about 4 seconds in IE8 for JQuery 1.4.4 and JQuery UI 1.8.5 (the newest version available in jsfiddle) When I try this on my Windows 7 laptop in a local html file with jquery 1.4.3 and JQuery UI 1.8.6 it's even taking 8 seconds. After profiling with the IE developer tools I found out that the slow parts are

  • .css({ top: 0, left: 0 }) on line 5003 in jqueryui-1.8.6.js : I think this can be removed as this was a workaround for a fixed bug.
  • uniqueSort on line 3092 called by refresh in jquery.ui.autocomplete.js on line 438 : maybe it's allowed to remove sorting? unless there's a good reason ofcourse, otherwise the sorting itself is hopefully improveable?

When I try these steps in a different IE, the same problems occur. When I try these steps in any other browser, the results come up blazingly fast.

Change History (7)

comment:1 Changed 12 years ago by Scott González

Milestone: TBD1.9
Status: newopen

.css({ top: 0, left: 0 }) can't be removed until 1.9 because we need to support older versions of jQuery.

comment:2 Changed 12 years ago by Scott González

Removed .css({ top: 0, left: 0 }) workaround in ca0ac5a64f6653fe8399a913538423b13d213307.

comment:3 Changed 12 years ago by Scott González

#6754 is a duplicate of this ticket.

comment:4 Changed 12 years ago by Scott González

Core ticket to improve performance of .children:

comment:5 Changed 12 years ago by Scott González

Resolution: fixed
Status: openclosed

I fixed the performance problem in jQuery core. I'd prefer just waiting for users to upgrade to a newer version of core than land a workaround in UI 1.8.x.

comment:6 Changed 12 years ago by jorisdekinder

Hi Scott, Should the issue be fixed now? When I test with the latest libraries (1.5.1 + UI 1.8.11) it still takes 5 seconds to show a list of 500 items... Thanks for looking into this.

comment:7 Changed 12 years ago by Scott González

Yes, this is as fixed as it will ever be. See which is the underlying cause and for the best perf improvement that the core team was willing to land.

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