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Chapter 18: Compressing the Web

Table 18.2: Content Encoding Average Compression Ratios for Different Web Site Categories (file size in bytes)

Web Site Type HTML, CSS, and JS Files OnlyAll Files Including Graphics
(Average for 5 Web Sites)Number of FilesOriginal SizeCompressed SizeSavingsOriginal SizeCompressed SizeSavings
High-Tech Company1426,5315,09279%60,65039,21135%
Newspaper3774,68816,21879%150,22091,74940%
Web Directory1136,09613,29669%50,16827,36846%
Sports2441,01110,16774%110,53079,68627%
Average2244,58211,19375%92,89259,50437%

High-tech: www.cisco.com, www.hp.com, www.ibm.com, www.microsoft.com, www.oracle.com
Newspapers: www.latimes.com, www.nytimes.com, www.usatoday.com, www.washingtonpost.com, www.wsj.com
Web directories: www.altavista.com, www.looksmart.com, www.lycos.com, www.netscape.com, www.yahoo.com
Sports: www.espn.com, sports.yahoo.com, sportsillustrated.cnn.com, www.sportsnetwork.com, www.usatoday.com/sports/front.htm

On average, the text portion of these sites was compressed by 75 percent. Overall, compression would save 37 percent in total file size.

Note: This table is from page 412 of Chapter 18: Compressing the Web from Speed Up Your Site: Web Site Optimization.

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