During the 1990s, DSL modems were quite dumb and needed a wireless router to perform firewall duties and NAT (Network Address Translation) to allow multiple computers to safely use the internet. Today, DSL providers such as Verizon and AT&T are providing DSL modems that can do these things and more. Unfortunately, if the wireless router does the same thing, it often causes network lag from all the unnecessary firewall packet inspection and NAT. This is a case where the customer's equipment does too much and causes a problem.

The lag may be more prevalent in some operating systems but all computers will be affected to some degree. It may only show up in certain instances such as freezing Youtube videos after a minute or two.

Vista wireless lag (and Windows 7) usually comes from OS wireless features, but DSL users should look at non-wireless causes as well.

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