Vista SP1 Will Deliver Big Network Speed Boost

I downloaded the release candidate of Vista Service Pack 1 yesterday and was prepared to wait till its public debut next week before writing about it. But after upgrading a few machines here and doing some tests, I changed my mind. If Microsoft’s decision to ditch the WGA kill switch in SP1 didn’t convince you, would you be interested in a 300% increase in tripling your network file transfer speeds?

Forget the reports you might have read about SP1 resulting in no performance boost. That story was based on a silly artificial benchmark involving scripting of Office applications. Back here in the real world, where gigabit network connections are now commonplace, you’ll see at least one huge improvement when transferring files over network connections.

In its original release, Vista had some design problems with its networking stack, resulting in slow file transfers, especially when connecting to computers running Windows XP, Windows Server 2003, or Windows Home Server (all three of these products share a great deal of their code base, including core networking components). In Vista SP1, file transfer speeds are dramatically improved. In this post, I’ll describe what I saw.

I did two sets of file-transfer tests using two separate systems configured to dual boot between Vista RTM and the new Vista SP1 release candidate. Both systems have dual- or quad-core processors (both in the Intel Core 2 Duo family) The first group of files consisted of two large DVD images in ISO format, totaling 4.2 GB.