If you want to run a DNS comparison speed test yourself from your own Mac, and you’re savvy with the command line, you can save this bash script as dnstest.sh (via cleanbrowsing) to your local directory, and then run the following command: Use a DNS comparison test, like DNSPerfTest (discussed below) or NameBench.Check DNS Resolving performance (general).Fortunately there are multiple ways to check DNS performance: This is a great question, since every user and every ISP will likely have different performance for different DNS providers. How do I know if Cloudflare DNS is faster for me? If you have multiple Macs and decide you want to use CloudFlare DNS on all of them, you’ll want to repeat the same DNS configuring setup process on each of them, and you could also change DNS servers on iPhone or iPad if you want to set those to use the service as well.
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Likewise it shouldn’t be necessary to flush DNS caches but you’re welcome to clear DNS cache anyway, you can learn how to reset DNS cache in MacOS High Sierra, Sierra, El Capitan, and other Mac OS X versions if need be. You should not need to quit and relaunch any networking apps for the change to take effect, but to be thorough you may want to anyway. When you apply the network setting changes your internet connection will likely temporarily disconnect and reconnect again. Click the “OK” button and then click “Apply”.If other DNS entries exist, click and drag the “1.1.1.1” and “1.0.0.1” entries above them in the list, or for maximum privacy and to rely entirely on Cloudflare DNS, delete the other DNS entries (it is recommended to make a note of any pre-configured DNS IP addresses just in case).