Since the address will not resolve DNS queries for the average user, the performance is effectively zero. If you set this in your network settings, your internet connection will stop working (browsers will say "DNS_PROBE_FINISHED_NO_INTERNET").
The IP address 3.3.3.3 is often mistakenly assumed to be a public DNS resolver (similar to Google's 8.8.8.8 or Quad9's 9.9.9.9), likely due to the "3" repeating pattern. However, it does not operate as a standard, widely recognized public DNS service. dns 3.3.3.3
Because Quad9 is incorporated in Switzerland, it falls under Swiss privacy law (FADP) and, by extension, respects GDPR principles for European users. This is a stark contrast to providers under US jurisdiction (like Google 8.8.8.8 or Cisco OpenDNS). Since the address will not resolve DNS queries
The Quad9 Privacy Pledge:
If you are concerned about government surveillance or ISP data selling, 3.3.3.3 is arguably the most privacy-respecting mainstream DNS option available. The IP address 3
Because 3.3.3.3 uses active threat blocking, you may occasionally encounter a "DNS resolution error" or a Quad9 block page for a legitimate site. This happens if the site has been temporarily compromised or shares an IP with a threat.
What to do: