I have a big jQuery code and I am thinking at speed performance of my functions. When an element is clicked (mousedown) i need to assign an image as background. I can do this by 2 ways:

$('#element li.class').css({"background":"someimageURL"});

or

$('#element li.class').addClass("someclass");

where "someclass" have the actual CSS background image. Witch function works better in this case.

Is there a way to test various functions speed?

Thank you

jquery css addclass
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