Try a few of your favorite websites, see how they compare. Are there any you recognize, are some sites querying a high number of ad, tracker or social media domains? Maybe others look really clean by comparison: they're loading their own HTML, images and scripts from their own servers, but not trying to share your details with the rest of the world. That works as a quick and easy demonstration of why some sites are really, really slow: they must access content from a long list of other domains before they can finish loading.īut it can also be interesting if you look at exactly which domains they're accessing. Some might store their own content - images, videos, comments, scripts - but they can also link to ad servers, trackers, all kinds of other third-party sites. Newspaper websites are often a good choice.ĭNSQuerySniffer can show a huge number of queries - 20, 30, 40, more - from a single page, because big websites often contact so many other many domains. To get a look at how DNS works on the web, just point your browser at a popular ad-packed website which you haven't visited so far today (because your system might have stored previous DNS query results, and you won't see them this time).
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