A new study has shown that jQuery is the fastest loading mainstream JavaScript library...
Check out the stats 
I'm not sure if their packed tests were using /packer/ but would assume they are. As I've said before, packed JavaScript files are only there as a last resort if you can't gzip things (in which case the reduction in download time generally outweighs the time it takes to unpack). Otherwise you should stick to minified + gzip for best results.
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