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Web page designs are getting richer and richer, which means more scripts, stylesheets, images, and Flash in the page. A first-time visitor to your page may have to make several HTTP requests, but by using the Expires header you make those components cacheable. This avoids unnecessary HTTP requests on subsequent page views. Expires headers are most often used with images, but they should be used on all components including scripts, stylesheets, and Flash components.
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Image with empty string src attribute occurs more than one will expect. It appears in different form causing the same effect: browser making requests to your server.
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80% of the end-user response time is spent on the front-end. Most of this time is tied up in downloading all the components in the page: images, stylesheets, scripts, Flash, etc. Reducing the number of components in turn reduces the number of HTTP requests required to render the page. This is the key to faster pages.
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The user's proximity to your web server has an impact on response times. Deploying your content across multiple, geographically dispersed servers will make your pages load faster from the user's perspective.
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Serving resources from two different hostnames increases parallelization of downloads.
The HTTP 1.1 specification states that browsers should allow at most two concurrent connections per hostname (although newer browsers allow more than that). If an HTML document contains references to more resources (e.g. CSS, JavaScript, images, etc.) than the maximum allowed on one host, the browser issues requests for that number of resources, and queues the rest.
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