jQuery script size

[jestro]

The size of the included jQuery script has ballooned up to 74KB in the latest 3.0 RC, nearly 3 times the size of the minified jQuery 1.4.2 script (24KB). This is adds a ton of unnecessary bloat / load time when the script is enqueued by theme or plugin authors. It appears Sizzle is included inside the jQuery script. In the spirit of keeping WP lightweight, fast, and modular, Sizzle should be extracted and jquery.js should include jQuery only.

[nacin]

We've been including Sizzle since jQuery 1.3, which was WordPress 2.8.

[jestro]

Replying to nacin:

We've been including Sizzle since jQuery 1.3, which was WordPress 2.8.

Up until now the size of the script has been teetering on the edge of "OMG that's huge!". At 74KB in 3.0 it has officially entered that territory and now has the potential to really slow down WP for a lot of users.

Is there a specific reason why it can't be extracted? Maybe provide a jquery.lite.js or similar for devs that actually only want "jQuery" and nothing more?

[nacin]

The official release of jQuery includes Sizzle bundled. I don't see much of an advantage to also bundle the light version.

[ocean90]

Ehm Sizzle is in jQuery and jQuery needs it, or I'm totally wrong?

[jestro]

Unless I am confused, the official production (minified) release of jQuery does not include Sizzle and is 24KB:

​http://jquery.com/
​http://code.jquery.com/jquery-1.4.2.min.js

And no, I don't believe jQuery requires Sizzle.

[ocean90]

Replying to ocean90:

Ehm Sizzle is in jQuery and jQuery needs it, or I'm totally wrong?

No, I'm no wrong: ​http://docs.jquery.com/Release:jQuery_1.3#Sizzle_Selector_Engine

jestro: Read the description:

* Includes Sizzle.js
 * http://sizzlejs.com/
 * Copyright 2010, The Dojo Foundation
 * Released under the MIT, BSD, and GPL Licenses.

[jestro]

ocean90: I am aware it includes Sizzle, that was the whole point of the ticket :)

[ocean90]

jestro:
You said:
The official production (minified) release of jQuery does not include Sizzle and is 24KB:

That's wrong, it includes Sizzle. Your linked version is the same as we use in core, I don't know, why they say 24KB.

[nacin]

The difference would be gzip compression. If your server properly gzips assets, you'll be serving a file about 24KB.

[nacin]

Best I can tell, Sizzle is standalone in that it does not require jQuery. The reverse is untrue; Sizzle is jQuery's selector dependency.

Closing as invalid.

[jestro]

Replying to nacin:

The difference would be gzip compression. If your server properly gzips assets, you'll be serving a file about 24KB.

I stand corrected, thanks for the clarification. I did not notice the gzip compression. Sorry to muddle up the Trac with this :(