What Makes Some Web Pages Load Slowly?
While surfing the Internet, you will find some sites load more slowly than others. This fact has less to do with your own Internet connection speed or computer and more to do with what is happening on the website's server.
Other People Are Reading
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Popular Websites Get Overloaded
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Every website exists in a physical form on a computer, otherwise known as a server. Popular websites that get lots of traffic frequently need upgrades to their servers to keep up with user demand. Especially in the case of a website that gets mentioned on radio or television or otherwise suddenly gains a big following, the site's servers are not often ready for the sudden influx of visitors.
Poor Design & Code
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Websites over-dependent upon large, inefficient scripts or too many graphics load more slowly. Professional, well-coded and well-maintained websites use caching scripts that create temporary, saved versions of dynamic pages to keep their servers from becoming overloaded. Sometimes website files are compressed, too, in order to make sites run faster. An example of a slower-running site is one that uses many scripts, repetitive coding techniques and images for titles where text should have been used.
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Advertisements
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Text-based advertisements usually do not cause problems, but pop-ups and pop-unders, animations, boxes, videos and other multimedia ads require a lot of processing power from your computer. For websites where keywords are automatically hyperlinked to advertisements, a script works to do this, and that places an extra burden on the website itself.
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References
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