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Speed internet browsing via a local domain name server
1) Mac OS X uses lookupd to cache all sorts of query results, including DNS results. The second time you request a web page, your mac will not initiate DNS requests that it did the first time. This is observable with tcpdump.
Speed internet browsing via a local domain name server
Windows doesn't use DirectX for its main GUI-drawing functions (yet, anyway... Longhorn will be a very different story). It uses GDI. There's a very good review of Longhorn's graphics architecture at Extremetech. But yes, it's safe to assume that GDI is probably faster than Quartz, but this is rather like saying that QuickDraw under OS9 is faster as well. They are very different beasts.
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