上周，我们对Windows7预览版、XP和Vista在一台三代操作系统的PC上的启动时间进行了计时。然而，我们的测试有其缺陷，我们没有将Vista的SP1包含在混合中，这是一个很大的嘘声，你们都在评论中提出了使它们更全面、更准确的方法。在您的带领下，我们平衡了竞争环境，安装了Vista service pack，添加了一组测试，将Windows一直带到完全加载的用户桌面，并更新了我们的数字。事实证明，Windows7预览版确实比Vista和XP都要快，但与我们最初发布的页边相比，它的速度一点也不快。在这里获取我们的更新编号和测试详细信息。

The hardware: My test system has an Intel Core 2 Duo processor running at 3.16GHz with 4GB of RAM. Windows XP, Vista, and the Windows 7 Preview are all installed on the same, physical SATA hard drive (unlike the last test, which had Win7 on an IDE drive). The version of Windows 7 that I'm using is the Preview release from last month's PDC conference, an incomplete, earlier-than-beta, for-testers-only edition, which automatically puts it at a disadvantage. Unlike the last set of tests, this time around I'm using Vista with Service Pack 1 installed (which it was not before—my apologies for that big, honking oversight). The test: Since I'm triple-booting the three operating systems, I used a simple handheld timer to get my numbers, starting at the "Choose your operating system" screen (which comes after the BIOS startup) and ending at a fully functional desktop in my first set of tests, then the user login screen in my second. I timed each OS startup three times and averaged the results to account for my fat fingers (which I did not in the first set of tests).

Test Set 1: From Boot Choice to Fully-loaded User Desktop

For this test set, I created a non-Administrator user account with nothing in startup, and set Windows to automatically log into it on boot. These numbers start at the OS boot choice screen, and end at a fully-functional, user desktop. This isn't a true test of how long a desktop would render in real-world usage, because most people DO have programs in their startup. But these tests are to compare Windows version performance, not third-party software. That all said, the numbers:

Operating System	Average time to reach desktop
Windows 7 Ultimate (Preview, PDC edition, 32-bit)	32 seconds
Windows Vista Ultimate (32-bit, SP1)	33 seconds
Windows XP Professional (SP3)	40 seconds

Test Set 2: From Boot Choice to User Login Screen

This test measures the amount of time from the boot OS choice screen to the user login prompt only, hence the shorter times.

Operating System	Average time to reach login prompt
Windows 7 Ultimate (Preview, PDC edition, 32-bit)	23 seconds
Windows Vista Ultimate (32-bit, SP1)	24 seconds
Windows XP Professional (SP3)	29 seconds

The Results

As you can see, the Windows 7 Preview is just a HAIR speedier than Windows Vista, not the 20% we saw in the first set of tests (I attribute this to Service Pack 1), and way, way faster than Windows XP (8 and 6 seconds, respectively). While it's not the 20% speed increase I saw in my first round of tests, it still bodes well for Windows 7, which still has a lot of growing up to do from its Preview status. Thanks to everyone who made suggesti*** on the first round of tests on how to make this more accurate and fair all around.