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High Performance Web Sites
book

High Performance Web Sites

by Steve Souders
September 2007
Intermediate to advanced content levelIntermediate to advanced
170 pages
4h 24m
English
O'Reilly Media, Inc.
Content preview from High Performance Web Sites

The Savings

Gzipping generally reduces the response size by about 70%. Table 6-2 shows examples of size reductions for scripts and stylesheets (small and large). In addition to gzip, the results for deflate are also shown.

Table 6-2. Compression sizes using gzip and deflate

File type

Uncompressed size

Gzip size

Gzip savings

Deflate size

Deflate savings

Script

3,277 bytes

1076 bytes

67%

1112 bytes

66%

Script

39,713 bytes

14,488 bytes

64%

16,583 bytes

58%

Stylesheet

968 bytes

426 bytes

56%

463 bytes

52%

Stylesheet

14,122 bytes

3,748 bytes

73%

4,665 bytes

67%

It's clear from Table 6-2 why gzip is typically the choice for compression. Gzip reduces the response by about 66% overall, while deflate reduces the response by 60%. For these files, gzip compresses ~6% more than deflate.

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Publisher Resources

ISBN: 9780596529307Errata Page