You'll find the tool under a new name, Reliability And Performance Monitor, on the Administrative Tools menu in Control Panel. Figure A shows the Performance Monitor, monitoring % Processor Time and Memory Pages/Second.
Figure A

You can use the Performance Monitor to assess performance of almost any component in the computer.
Performance Information And Tools
A new feature in Vista is the Performance Information And Tools control panel, which analyzes your computer's hardware components and assigns a rating known as the Windows Experience Index (WEI) score. Your processor, RAM, graphics capabilities (separately rated for Aero and for gaming/3D), and primary hard disk are each rated individually. The lowest score determines your overall WEI score.Possible scores range from 1.0 to 5.9. Generally, a computer needs a base WEI of 3.0 or better to satisfactorily run Aero and other advanced features. To find out your WEI, click Start | Control Panel | Performance Information And Tools.
Running this tool showed me why using Vista on my laptop was such a different experience from using it on my desktop. As shown in Figure B and Figure C, the desktop machine's hardware rated a 5.1, whereas the laptop scored a measly 2.0.
Figure C

A score under 3.0, such as that of my Sony laptop, is likely to result in a poor Aero experience.
That leads me to this question: Why is Sony selling these systems with Vista Business installed if they won't run the interface properly? But that doesn't help with the immediate problem: How can I make this computer work acceptably and benefit from at least some of Vista's new features?
The Performance Information And Tools interface makes it easy for you to tweak several components that can affect Vista performance. These options are shown in the Tasks pane on the left side of the window, as you can see in Figure C. Some performance tweaks you can do from this interface include:
- Managing startup programs to help Vista load more quickly
- Adjusting visual effects to help Vista perform better if you have an inadequate video card
- Adjusting other advanced settings that affect performance, such as processor allocation and paging file location and size
- Adjusting indexing options to prevent indexing from using up too many resources and thus slowing other applications
- Adjusting power settings to balance performance needs with energy conservation needs
- Cleaning up the hard disk so Vista can access data stored there more quickly
- Using advanced tools, such as the disk defragmenter, task manager, system information tool, event logs, and Reliability And Performance Monitor to diagnose performance problems and fix them

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