Selection of tags slower in 1.1.3 than 1.1.2

[krudd]

So far I've only looked at the speed decrease when selecting 'input' elements, so it may be isolated to them or something general.

(You'll need Firebug on Firefox, Firebug lite is included though for other browsers.)

Here's a page with using 1.1.2:

​http://krudd.net/jquery113speed/jquery_elementtest_112.html

Result: setup: 781ms

Here's the same page using 1.1.3:

​http://krudd.net/jquery113speed/jquery_elementtest_113.html

Result: setup: 1937ms

And for kicks I looked at using "straight" DOM methods to select the 'inputs' (getElementsByTagName) and 1.1.3:

​http://krudd.net/jquery113speed/jquery_elementtest_113_dom.html

Result: setup: 531ms

I haven't had time to dig through the 1.1.3 source to see where the slowdown could be occurring.

Under IE there is a similar, though markedly smaller, slow down between 1.1.2 and 1.1.3.

[rformato]

Profiling in firebug, it seems most of the time is spent inside find.

For a simple tag search 4 non trivial and fixed regex are compiled on each find execution. They are:

	reg1: new RegExp("^[/>]\\s*(" + jQuery.chars + "+)"),
	reg2: /^((\/?\.\.)|([>\/+~]))\s*([a-z]*)/i,
	reg3: new RegExp("^(" + jQuery.chars + "+)(#)(" + jQuery.chars + "+)"),
	reg4: new RegExp("^([#.]?)(" + jQuery.chars + "*)"),

Moving them from find to properties of the jQuery object made 1.1.3 faster then 1.1.2 in my tests on ff for windows.

[john]

Fixed in SVN rev [2818].