更新，11/10/2008：这些测试已被一组新的更新测试所取代，这些测试使用最新的Vista service pack和单个硬盘驱动器。微软说“一个非常好的系统在15秒内启动”，虽然早期发布的Windows7预览版启动时间不到15秒，但它的启动速度确实比我电脑上的WindowsVista快20%。要真正比较操作系统之间的启动时间，唯一的方法就是在相同的硬件上进行测试。从今天起，我将在一台新建的PC上三次启动XP、Vista和Windows7预览版。结果如何？Windows7的启动速度比WindowsVista快得多，但令人惊讶的是，并不比WindowsXP快。这是我的确切数字、机器规格和注意事项。

Update, 11/10/2008: These tests have been superseded by a new set of updated tests which use the latest Vista service pack and a single hard drive. The hardware: My test system has an Intel Core 2 Duo processor running at 3.16GHz with 4GB of RAM. The only difference between XP, Vista, and the Windows 7 Preview is that Win7 is installed on an IDE hard drive, and XP and Vista are booting from SATA drives. That puts Win7 at a slight disadvantage because IDE drives are not as performant as SATA. Also: 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. One can only assume it will get better (read:faster) in the final release. 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 the user login screen. These tests do not include the amount of time it takes to load the user's desktop, because that depends entirely on what's in your Windows startup. This is simple, pure, operating system boot here—no desktop or BIOS involved. Here are my final numbers from starting the three operating systems on the same box and timing them: