numbers for people.

What percent of web visitors support gzip, deflate and sdch?

On the same set of users I checked for multiple languages in accept-headers, I checked to see what compression their browsers supported from the Accept-Encoding header. This data isn’t as important to me since the server negotiates compression automatically, but I was still curious:

  • gzip 96%
  • deflate 93%
  • sdch 22%

That’s quite an impressive showing for Google’s sdch which was only proposed in late 2008. It also drives home the point: enable GZip on the server, 96% of your visitors will get a better experience.

Again, here’s the raw data:

  • gzip, deflate (479)
  • gzip,deflate,sdch (197)
  • gzip,deflate (151)
  • [null] (29)
  • gzip (25)
  • identity (4)
  • deflate, gzip, x-gzip, identity, *;q=0 (2)
  • gzip, deflate, x-gzip, identity; q=0.9 (1)
  • gzip, deflate, identity (1)
  • gzip,deflate,bzip2 (1)

[the total count (890) doesn’t match up with the accept-languages article since I’m de-duping differently, don’t consider this to be super scientifically rigorous.]

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