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Why Upload images on other domain - Useful for SEO or not?

 12:55 pm on Apr 3, 2013 (gmt 0)

Why do top sites upload images and css on external domains not on same?

Any SEO specific reason or something else?



 1:01 pm on Apr 3, 2013 (gmt 0)

When images are served from a different hostname, many browsers will establish more parallel http connections. This means the page can load faster, and there is a small SEO advantage in the extra speed.

Also when a site's server is very busy, the images can be on a different machine and that helps spread the load - another potential speed gain.


 1:47 pm on Apr 3, 2013 (gmt 0)

This is also an increasing popularity of content delivery networks (CDNs) which also help offset the load and sometimes improve image loading time.

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