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Bad DNS Trips Can Ruin Web Performance

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www.aberdeen.com It may seem a little weird that DNS would have an impact on your performance. After all, the main thing it does is convert the web address that the user enters in the browser (as in yoursitesandapps.com) and points it at the actual IP address or name of your website or application. And for a long time, it was true that DNS didn't impact performance all that much. But many trends in web sites and applications have come about in recent years that have led to sluggish performance that can be linked directly to DNS. One of the first and most common, is the rise of modular web sites and applications. By building web content that consists of pieces from multiple sites and applications, businesses can take advantage of lots of great capabilities without having to start from scratch. However, loading this web content can mean having to resolve multiple DNS queries within a single page or application. Another issue is with web content that has too short of a TTL (time to live). It used to be that TTLs were set to hours or more, presenting very little impact on performance. Today, some web content will have TTLs set to seconds, meaning constant DNS lookups, which adds the potential for increasing delays in resolving this web content. Probably one of the most frustrating causes of poor DNS performance comes from something that many organizations do to improve web performance. Companies often turn to Content Delivery Network providers and Global Server Load Balancing (GSLB) services to increase performance by putting content closer to wherever customers and users are. However, this also results in the use of long CNAME addresses for this web content (meaning that when you type that single website URL, it actually resolves across several DNS points using very long address chains). This can result in DNS roundtrips that are triple what Most organizations don't think too much about their DNS; in fact, many just use whatever their ISP or Internet connectivity provider gives them. Want to learn more? Watch the webinar, The Rising Impact of Internet Performance on Customers, presented by Aberdeen Group and Dyn.

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