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ThinkPad notebooks and ThinkCentre desktop PCs for businesses will boot Windows 7 up to 56% faster than when loading XP or Vista, Lenovo said.

Meanwhile, IdeaPad and IdeaCentre consumer PCs certified for "Windows 7 Lenovo Enhanced Experience" will load 33% faster and shut down 50% faster than hardware that's noncertified but otherwise identical.

Howard Locker, director of new technology at the Chinese PC maker, told Computerworld that in some cases, "we went from a one-minute boot-up to 30 seconds, and took shutdown from 20 seconds down to 10."

Locker, who also holds the title of "master inventor" at Lenovo, credits this "unbelievable job" to three years of engineering work during which Lenovo's Velocity team, in close collaboration with Microsoft Corp., literally "timed every single driver and app."

Here are some of the specific steps Lenovo took to fine-tune Windows 7:

* Fixed the drivers of onboard hardware components that were cumulatively causing massive delays. For instance, Lenovo discovered that a driver for a "popular wireless device" had been written to pass worst-condition certification specs and thus would grab 4MB of continuous memory from the system in 4KB chunks, Locker said. This added five seconds to the time it took for a PC to go to sleep. After getting the third-party vendor to fix the driver, Lenovo cut the driver's overhead to just 200 milliseconds.
* Tweaked the BIOS phase of start-up to temporarily hide some devices from Windows 7, so that the operating system loads the drivers only after the boot is finished.
* Tweaked Windows 7 to delay the loading of nonessential services and applications until after start-up. Those include automatic-updating apps for Adobe and Microsoft, or even Windows features. While users can try to fiddle with Windows themselves, Locker warned that do-it-yourselfers likely won't achieve the same improvements.
* Rewrote its power manager to be easier to use. It also included an extra chip in its notebooks to more precisely measure the remaining battery life than Windows 7 can, and to help you make it last as long as possible.

Independent analyst Jack Gold applauded Lenovo's work with Windows 7, saying that customers were fed up with Windows' slow boot-up time even before Apple Inc. and Google Inc. used it as a talking point to score points against Microsoft.

"It was Vista that screwed it all up, as boot-ups took twice as long as [with] XP," Gold said. "It was just ugly."

It's not clear, however, that Lenovo has done more work than its rival PC vendors or is merely "branding it better," he said.

"HP does this; Toshiba and Dell, too," Gold added.

And what about the tendency of Windows to slow down over time as applications, hardware and service packs are added to it? Lenovo will try to stem that by keeping its Velocity team in North Carolina busy testing drivers of popular devices against Windows 7 and its hardware, Locker said.