And one excellent commercial: http://www.codehouse.com/products/soc/
(there is 30-day trial period, so you can test it).
3. gzip response. This is widely used and almost a must in all today’s applications. Usually you would configure your webserver for this (Apache mod_gzip or for Tomcat compresion=”onî in server.xml), but you can do it also over servlet filter.
Here is one that works – download gzip.rar.
All these things reduced my .js size by more then 60% and that is a huge win.