Comments on: Quick Tip – Optimizing DOM Traversal

By: 5 Performance Tuning Tricks for jQuery | Learning jQuery

5 Performance Tuning Tricks for jQuery | Learning jQuery — Wed, 29 Jul 2009 05:11:27 +0000

[...] be further optimized by using an id in addition to the element and class. As explained in this jQuery performance tip, jQuery’s DOM traversal processes id selection fastest, followed by element and class selection. [...]

By: 5 Performance Tuning Tricks for jQuery | Jon Raasch's Blog

5 Performance Tuning Tricks for jQuery | Jon Raasch's Blog — Thu, 16 Jul 2009 16:46:15 +0000

By: jack

jack — Wed, 03 Jun 2009 17:05:59 +0000

I agree is there somewhere we can find an update on this great post? I’m using jquery 1.3

By: Wick

Wick — Fri, 20 Feb 2009 15:42:16 +0000

Is there somewhere where the Sizzle/jQuery 1.3.x selector optimization changes have been discussed? I only found a few mentions of the new “bottom-up” approach but nothing in detail. An in-depth explanation would be really helpful! Thanks.

By: Karl Swedberg

Karl Swedberg — Tue, 03 Feb 2009 19:55:26 +0000

Good points, Frédéric. Thanks. I’ve updated the post.

By: Frédéric Hewitt

Frédéric Hewitt — Tue, 03 Feb 2009 16:03:14 +0000

That's no more exact since jQuery 1.3 and Sizzle, because it now works bottom-top. So $('#sidebar .menu') is not better (worst in fact) than just $('.menu'). But evidently, $('ul.menu') still the best choice here. Well on other side, we can probably say than selector optimization is no more useful now for common situations.

By: JEDI » Blog Archive » Is your Jquery or Javascript getting Slow or bad Performance ?

Fri, 10 Oct 2008 13:08:44 +0000

[...] http://www.learningjquery.com/2006/12/quick-tip-optimizing-dom-traversal [...]

By: cherouvim

cherouvim — Thu, 26 Jul 2007 08:38:09 +0000

Great stuff! Thanks.

By: Tom

Tom — Wed, 13 Jun 2007 18:03:00 +0000

Useful, all very useful! Great post, great site. Much obliged…

By: enej

enej — Sat, 23 Dec 2006 11:33:54 +0000

No thank you Karl

For your time and effort.

Thanks again. It’s just interesting to see. I think I will try to come up with some test myself, Last summer I was working on a web app. and used jQuery quite a bit. and it really helped when I did something like $('#id div.feeditem') instead of just $(‘.feeditem’) impoved the whole loding of the page quite a bit. But if I do any more testing I will let you know. And Merry Xmas