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A J2EE servlet filter which compresses data written to the response. It supports several algorithms (gzip, deflate, etc.) and emphasizes minimal memory usage and high throughput. Also provides detailed performance stats.

Check this link: http://sourceforge.net/projects/pjl-comp-filter/

Much easier: http://showcase.omnifaces.org/filters/G ... onseFilter

Since imo omnifaces should already be present in any jsf project