For tests I used Mootools v1.11 downloaded full with no compression.
Highest compression level is with “high ascii” setting, “fast decode” unchecked and obtained a 0.224 compression. It uses Dean Edwards algorithm.
This script runs in your browser. Obtained a 51.1% level of compression.
This will ask you to upload the js script and will return a compressed version.
Set on agressive mode, will compress the test file to 40.4%.
We had a 41.9 level of compression. This script is able to pack pack and combine more scripts in one file, so it saves the number of connections between browser and server.
This seems to be the winner. cause it compress the file with 83.3%.
You have to set the charset to “ISO-8859-1″ or your script will not work.
Let us know if we missed some tools.