Resource Accelerate can compress files using gzip. Resource Accelerate will not only gzip a file, but it will also cache the gzipped file in order to reduce the processing required to compress files on the fly for each request. By acting as a filter, the gzipper can gzip resources from servlets, jsps, and static files. The gzipper will automatically check on every request to make sure that the cached compressed file is most recent version of the original resource so there will never be a stale file delivered to the client. Many people do not like to use gzip compression on their servers because of the extra load on the servers, but by using caching there is little or even reduced load on servers with this technique. As is setup in the default configuration you should not apply compression to gifs, jpegs, or pngs as they will not efficiently compress. CSS, JavaScript, and static Html files can be compressed and often can be compressed 60-80%.