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What is DNS Resolution Time?
DNS resolution time is how long it takes a browser to find out where your website actually lives. People type or click domain names like yourstore.com, but computers connect using IP addresses. The Domain Name System (DNS) is the lookup service that translates one into the other, and DNS resolution time is how long that translation takes.
It happens before anything else. The browser can’t open a connection, request your HTML or download a single image until it knows which server to talk to. That makes DNS the very first slice of Time to First Byte, and every loading metric after it has to wait.
The good news is that the answer usually gets cached. Once a visitor’s browser, device or internet provider has looked up your domain, it can reuse the result for a while, so repeat visits often skip the lookup almost entirely. Google’s own documentation puts lookup times anywhere from under a millisecond for cached results to hundreds of milliseconds when the request has to pass through several DNS servers.
What this means for revenue
A single slow lookup won’t make headlines, but it hits exactly the visitors you worked hardest to get. First-time visitors from ads, search or social usually don’t have your domain cached, so they pay the full DNS cost on their very first page view. That’s when first impressions get made and bounce decisions happen.
It also stacks up behind the scenes. Every third-party domain on a page, from your review widget to analytics and chat tools, can need its own lookup. A product page pulling from ten different domains might be waiting on ten lookups before everything is in place.
The fixes are usually cheap compared to other performance work. Moving to a fast, well-distributed DNS provider, trimming third-party domains you don’t really need, and adding dns-prefetch or preconnect hints for the ones you keep can take a noticeable bite out of load time.
How Uxify helps
You can’t fix what you can’t see, and DNS delays are easy to miss in lab tests run from fast data centers. Uxify’s TTFB breakdown splits Time to First Byte into its parts, DNS time included, and shows each one against a healthy target so you know which part is actually slowing you down. Ask Uxi can then dig into those numbers and tell you what to change. And for every click after that, Navigation AI loads the next page in the background before the visitor taps, so there’s no network trip left to wait on when they do.
DNS Resolution Time FAQs
What’s a good DNS resolution time?
Uxify’s benchmark puts a healthy DNS time at 50 ms or less. Cached lookups are usually close to instant. If your real-user data shows DNS regularly running well above that, especially for new visitors or specific countries, your DNS provider is worth a closer look.
What’s the difference between DNS resolution time and TTFB?
DNS resolution time is one part of TTFB. TTFB covers everything from the request to the first byte of the response: the DNS lookup, connection setup, TLS negotiation and server processing. A slow TTFB can come from any of those, so a breakdown helps you see whether DNS is really the problem.
What is dns-prefetch?
It’s a one-line hint in your page’s HTML that tells the browser to look up a domain early, before it’s actually needed. It works best for third-party domains your page loads from later, like a font service or chat widget. Preconnect goes a step further and opens the full connection too, so save it for the few domains that matter most on first load.
Does a CDN improve DNS resolution time?
Often, yes. Many CDNs run large, globally distributed DNS networks, so lookups get answered from a server close to the visitor instead of one on the other side of the world. It’s not automatic though. If your DNS still points to a slow provider, the CDN only speeds up what happens after the lookup.