Vista SP1 no faster than stock OS, say testing experts

Computerworld - Editor's note: The person quoted in this story as "Craig Barth" is actually Randall C. Kennedy, an InfoWorld contributor. Kennedy, who presented himself as the CTO of Devil Mountain Software, no longer works at InfoWorld. Given that he disguised his identity to Computerworld and a number of other publications, the credibility of Kennedy's statements is called into question. Rather than simply remove stories in which he is quoted, we have left them online so readers can weigh his data and conclusions for themselves.

Windows Vista Service Pack 1 (SP1) is not measurably faster than the original stock edition, a Florida-based developer of performance testing and network metrics software said today.

"Microsoft has hinted that SP1 is faster than Vista RTM," said Craig Barth, the chief technology officer at Devil Mountain Software, referring to the release to manufacturing version of the operating system. "But we found pretty much nothing measurable. It surprised me as much as it surprised everyone else, but the numbers are the numbers."

Devil Mountain ran its DMS Clarity Studio framework on a laptop Barth described as a "barn burner" -- dual-core processor, dedicated graphics, and either 1GB or 2GB of memory -- to compare performance of the SP1 release candidate that Microsoft Corp. released last week with the RTM version that hit general distribution last January. The Vista RTM was not updated with any of the bug fixes, patches or performance packs that Microsoft has pushed through Windows Update since the operating system's debut.

"One gigabyte, 2GB [of memory], it didn't make a difference," said Barth. "SP1 was never more than 1% or 2% faster."

The difference between Vista RTM and SP1 on Devil Mountain's Microsoft Office-based test script was "statistically insignificant," Barth said, while a multitasking test panel produced results for SP1 less than 1% faster than RTM.

"Our goal wasn't to bash Vista," said Barth. "We've been doing this for a while, we know how to do it, and we tried to be as clinical as possible. But SP1 is not going to be a panacea for any performance problems users have with Vista. If you've been disappointed with the performance of Windows Vista, you're not going to be any happier with SP1."

The bottom line: It's Vista's architecture and feature set -- Barth cited Volume Shadow Copy, Vista's snapshot service, as an example -- not a lack of fine-tuning or bug fixes that makes it perform poorly on PCs that run Windows XP blazingly fast.

Microsoft has touted a pair of performance packs that it has delivered to Vista users via Windows Update and that have also been rolled into SP1. The updates, issued most recently just last week, have included fixes for such performance-related issues as slow waking from power-saving states. Microsoft was not immediately available to comment on the Monday test results.