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Editorial Team
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Asked: 2026-05-24T22:48:33+00:00

I used Visual Studio 2010 excellent javascript profiler to profile the javascript of a

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I used Visual Studio 2010 excellent javascript profiler to profile the javascript of a web page on Internet Explorer.
(Analyze / Launch perf wizard / Instrumentation / JS application / profile js + url of page)

The perf report shows that jQuery’s sizzle is the cause of the slowness (ie: some jquery selectors on my web page).

It shows the time spent is in Sizzle > filter > hidden > PSEUDO.
I do not have any selector with :hidden, so i don’t understand why it looses this much time in hidden.

I’m using jQuery 1.4.4
I tried with jQuery 1.5 and it is the same.

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1 Answer

  1. Editorial Team

    As mentioned in the comment, :visible calls :hidden so if you’re using that, it will show in the profiler.

    Also note, that on the jQuery doc for the :hidden selector it mentions

    Because :hidden is a jQuery extension and not part of the CSS
    specification, queries using :hidden cannot take advantage of the
    performance boost provided by the native DOM querySelectorAll()
    method. To achieve the best performance when using :hidden to select
    elements, first select the elements using a pure CSS selector, then
    use .filter(“:hidden”)    .

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