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Editorial Team
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Asked: 2026-05-14T04:17:29+00:00

Looking into selector performance between $(‘#ID1, #ID2, #ID3’) vs $(‘1X CLASS’). Which is faster?

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Looking into selector performance between $(‘#ID1, #ID2, #ID3’) vs $(‘1X CLASS’). Which is faster?

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  1. Editorial Team

    Looks like .class is working faster for this case. jQuery might not be going the getElementById route. Chrome and Safari are probably being optimizing with getElementsByClassName.

    Tests @ http://jsfiddle.net/mGqyH/4/

    Chrome

    Chrome http://img339.imageshack.us/img339/5021/chromew.png

    Safari

    alt text http://img339.imageshack.us/img339/5021/chromew.png

    Firefox

    Firefox performance http://img94.imageshack.us/img94/1123/firefoxg.png

    Document used (modified)

    http://www.w3.org/TR/DOM-Level-2-Events/events.html

    combined IDs selector

    $("#Events, #table-of-contents, #Events-overview, #Events-flow-capture, #Events-EventTarget, #Events-EventListener")

    disjoint IDs selector

    $("#Events").add("#table-of-contents").add("#Events-overview").add("#Events-flow-capture").add("#Events-EventTarget").add("#Events-EventListener");

    class selector

    $(".selectMe")
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