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Split the Assets Among Domains

Started by sukishan, Aug 23, 2009, 12:18 AM

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sukishan

Split the Assets Among Domains

It's completely up to you which assets you decide to host on i1.example.org and which you decide to host on i2.example.org -- there's no clear directive on this point. Just make sure you don't randomize the domain on each request, as this will cause the same assets to be downloaded twice -- once from i1 and once from i2.

You could aim to split your assets evenly by file size, or by some other criterion that makes sense for your pages. You may also choose to put all content images (those that are included in your HTML with <img /> tags) on i1 and all layout images (those referenced by CSS's background-image:url()) on i2, although in some cases this solution may not be optimal. In such cases, the browser will download and process the CSS files and then, depending on which rules need to be applied, will selectively download only images that are needed by the style sheet. The result is that the images referenced by CSS may not download immediately, so the load on your asset servers may not be balanced.

The best way to decide on splitting assets is by experimentation; you can use Firebug's Net panel to monitor the sequence in which assets download, then decide how you should spread components across domains in order to speed up the download process.
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