We’ve all heard it before. Use Google DNS if you want speed. But here's the thing. DNS performance isn’t universal. The “fastest” option depends largely on where you are, what sites you visit, and what’s happening on the network at that exact moment.
In fact, when I ran a DNS speed test on my system, Google’s 8.8.8.8 not only missed the top spot, it wasn’t even in the top two. In other words, the only way to find the fastest DNS server is to test it on your own connection.
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How DNS speed tests actually measure performance
Different tools, different answers
There are plenty of different tools for testing DNS speeds. Some, like GRC DNS Benchmark, require a download, while others, like DNSPerf, rely on global data and aggregated measurements. For this test, I went with DNS Speed Test because it runs entirely inside a browser and is also completely free with zero ads.
More importantly, DNS Speed Test doesn’t rely on synthetic benchmarks or distant servers. Instead, every query is sent from your actual network, which means your Wi-Fi quality, your ISP routing, and even the network congestion all come into play.
The tool uses DNS-over-HTTPS, or DoH, which is how most browsers handle DNS requests. Each lookup is encrypted and sent over HTTPS, just like when you load a website. In a way, it mimics what happens during everyday browsing and measures every request from start to finish using high-resolution timers inside your browser.
Another thing I like about this tool is that it doesn't just fire off cold requests. Before measuring anything, it first warms up each DNS server. This way, providers aren’t unfairly penalized for being slow on the first request but performing well once things are up and running. In other words, this is as close as you can get to a real-world DNS performance test.
Quiz
The MUO DNS & Networking Challenge
Think you know why the internet hesitates? Put your DNS and networking knowledge to the ultimate test.
What does DNS stand for?
What is the term for the delay caused when your computer has to look up a domain name before loading a website?
Which of the following is Cloudflare's primary public DNS resolver IP address?
Which port does standard, unencrypted DNS traffic typically use?
What type of attack involves corrupting a DNS resolver's cache to redirect users to malicious websites?
What is a DNS TTL value used for?
Which type of DNS record is responsible for mapping a domain name to an IPv6 address?
In the original 1983 DNS specification (RFC 882), what was used to resolve hostnames before DNS existed and is still present on every modern operating system?
Your Score
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Putting DNS servers to test
Expect the unexpected
The best thing about the DNS Speed Test tool is how easy it is to run. Simply open it in your browser and hit Run Speed Test. The entire process takes less than a minute, and when it’s done, you’ll see the top three DNS providers ranked by response time in milliseconds.
This is the number that indicates how quickly a DNS server responds to a lookup request. Since most websites these days trigger multiple DNS lookups, even small differences can quickly add up. Scroll down, and you’ll also see a table that shows minimum, maximum, median, and average speeds of each DNS provider. This is handy because consistency matters just as much as raw speed.
In my case, neither Google DNS nor Cloudflare tops the list, even though they're known for speed. And that’s the thing about DNS servers. There’s no one-size-fits-all answer. It depends on several factors, like your location, how your ISP routes traffic, and even real-time network conditions. That’s why, instead of relying on general recommendations, it’s best to run your own test and see what works best for you.
Don’t trust your DNS test results right away
Run the test wrong, and the results mean nothing
Running the DNS Speed Test tool is easy enough, but you need to keep a few things in mind. For instance, running the test only once won’t paint the full picture. You should run it multiple times a day to smooth out random spikes and factor in network congestion.
By default, DNS Speed Test uses only popular websites like Google, YouTube, Facebook, ChatGPT, and Reddit for the test. And the problem is that most DNS servers aggressively cache these popular domains because they’re requested so often. This can make some servers look faster than they really are.
The good thing is, you can edit the list of websites used during the test. Adding smaller or less frequently visited sites, especially the ones you often visit, will give you a more accurate idea of how well a DNS server is performing. Lastly, make sure to clear the DNS cache so the results aren’t influenced by previously stored records.
Switching DNS servers is something everyone should do
It’s not all about speed
Of course, switching DNS servers isn’t as dramatic as upgrading your internet plan or buying a faster router. But it still matters for a couple of reasons. When you stick with the default DNS server, your ISP can easily log your entire browsing history, which can be used for targeted advertising or even shared with third parties. An easy way to avoid that is to use a privacy-focused DNS server.
Switching DNS servers can also unlock some handy features. Some providers offer extra features that block malicious domains, filter ads, and prevent trackers from loading. It’s a great way to add a bit of privacy and security for free.
So yes, DNS may seem like a small change, but it’s still worth doing. Most importantly, speed isn’t the only factor. Privacy, reliability, and added features all play a role in choosing the right DNS.