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Now that you have all your performance counters set up and displaying data, you need to select the interval time of how often the data will be updated. How often you want the counters to be updated depends on your purpose for monitoring your hardware. For example, if you are trying to track how much data your computer is sending through your network adapter every day or hour, it is not necessary to have that counter update every second. You will just be wasting CPU cycles because you are making the computer constantly update that performance counter. However, if you are interested in current memory or CPU utilization, you will want a much faster update time.

To change the update interval, perform the following steps:

1. While in the Performance Monitor section of the Reliability and Performance Monitor, click the Properties button, which looks like a hand pointing to a notebook. Alternatively, you can press Ctrl+Q.
2. After the System Monitor Properties window loads, click the General tab.
3. Locate the Graph elements section and update the Sample Every text box. This number is in seconds.
4. Click OK to close the window and save your changes.

Now Performance Monitor will poll the data sources at your specified interval.