One year on: XP still outshining Vista

New tests have revealed XP with the beta SP3 has twice the performance of Vista, even with the newer OS' long-awaited SP1.

Vista's first service pack, to be released early next year, is intended to boost the operating system's performance. However, when Vista with the SP1 beta was put through benchmark testing by researchers at Devil Mountain Software the improvement was not overwhelming - leaving the latest Windows iteration outshined by its predecessor.

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Vista, both with and without SP1, performed more than two times slower than XP with SP3 in the test, taking more than 80 seconds to complete the test, compared to the beta-SP3-enhanced XP's 35 seconds.

Vista's performance with the service pack increased less than two per cent compared to performance without SP1 - much lower than XP's SP3 improvement of 10 per cent.

The tests, run on a Dell XPS M1710 test bed with 2GHz Core 2 Duo CPU and 1GB of RAM, put Microsoft Office 2007 through a set of productivity tasks, including creating a compound document and supporting workbooks and presentations materials.

In response to the test, a Microsoft spokesperson said in a statement, although the company understood the interest in the service packs, they are "still in development" and will continue to evolve before their release. It said: "It has always been our goal to deliver service packs that meet the full spectrum of customer needs."

If SP1 does not evolve sufficiently, it could be another setback for Vista, with many businesses waiting to adopt the operating system until the service pack is released.

One year after its launch, only 13 per cent of businesses have adopted Vista, according to a survey of IT professionals.

Microsoft admits that the launch has not run as well as it would have liked. Mike Sievert, corporate vice president of Microsoft, said in a recent interview: "Frankly, the world wasn't 100 per cent ready for Windows Vista."

XP has proved to be more popular than its younger sibling, with the first six months of US retail sales of box copies of Vista 59.7 per cent below those of XP's in the equivalent period after its release.

Microsoft has had to allow PC manufacturers to continue to sell XP on new PCs, setting a deadline for the last sale at 31 January next year. However, the pressure from manufacturers and consumers has been so great Microsoft has been forced to increase the deadline for another five months until June.

According to Microsoft, sales of Vista have been picking up, with the software giant reporting 88 million units sold.

Suzanne Tindal writes for ZDNet Australia, Ina Fried at CNET News.com contributed to this article.