YSlow: Compress components
Save time and bandwidth by compressing resources.
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Details from Yahoo!
Compression reduces response times by reducing the size of the HTTP response.
Compressing as many file types as possible is an easy way to reduce page weight and accelerate the user experience.
Gzip is the most popular and effective compression method currently available and generally reduces the response size by about 70%. Approximately 90% of today's Internet traffic travels through browsers that claim to support gzip.