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DNSleaktest.com offers a simple test to determine if you DNS requests are being leaked which may represent a critical privacy threat. The test takes only a few seconds and we show you how you can simply fix the problem. DNS Performance Comparison: Google, Quad9, OpenDNS, Norton Second, we actually measure the cached DNS lookup for a couple domains: Google.com, Yahoo.com and Medium.com and compared all the players. TLDR: Google was the most stable and with the best average performance across all locations. Quad9 is pretty strong and faster than Google in multiple locations.