Comments on: jQuery 1.4 performance

By: Using jQuery

Using jQuery — Wed, 27 Oct 2010 05:59:43 +0000

using a minified version of jQuery def makes a big difference

By: Dmitry Chaplinsky

Dmitry Chaplinsky — Sat, 23 Jan 2010 21:06:46 +0000

Hi Steve.

I performed series of tests on our merges (25 JS files of different size and content) with and without gzip.

Average benefit of closure compiler over YUI for non-gzipped files is 3.04% (0.7%-7.77%), and 2.64% (0.15%-6.52%) for gzipped ones.

Not so big difference :(

I can share spreadsheet, if somebody needs it.

By: John

John — Tue, 19 Jan 2010 18:07:29 +0000

Closure Compiler Advanced mode will never be “safe” if you expect to use without changing your code. It gets its size wins by requiring more information than the raw javascript code (all external referenced must be declared in “extern” files and all internally declared names referenced externally must be “exported”. If you invest the time to do this the wins can be massive, 85% or more if you are working with a large library.

By: stoimen

stoimen — Tue, 19 Jan 2010 08:33:08 +0000

Hi Steve,

after reading this post I was amazed to hear about Google Closure Compiler and start doing some tests right away. In the project I’m working on I use both jQuery and OpenLayers javascript libraries. The resulting .js file is really huge and I used YUI Compressor to compress it. The good news is that with the advanced mode turned on Google Closure manage to compress it even more resulting in more than 50% of savings from the original file and with more than 100K more than YUI. The bad news is that this code isn’t working. As it’s well known Closure Compiler is not save in advanced mode and I’m waiting until this happens! Then GCC will be probably the best tool to minify/compress.

By: Greg Schechter

Greg Schechter — Sat, 16 Jan 2010 20:21:03 +0000

We don’t use either compiler at Amazon(not that I haven’t tried to convince them otherwise). Using Closure Compiler I saw on average a 10.4% savings gzipped as opposed to 4.6% with YUI Compressor.
My Data: http://spreadsheets.google.com/pub?key=tcQVvzrVDhnT33MxfA3UZow&output=html