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Can I Block Advertisers and Ad Servers?
No, but for good reason. Blocking advertising providers at the DNS level can have adverse affects on browsing behavior and speed.
Significant reduction in speed is partially due to the process used by many browsers to render a Web page. Each element of content on a Web page is loaded sequentially and if several elements are blocked, the browser waits for a timeout to expire before moving to the next element. This will cause very significant delays when there are multiple elements being blocked.
This performance degradation on the user experience is the main reason OpenDNS does not offer an Advertising category in Web Content filtering.