Keeping monitoring overhead low. In general, the performance tools are designed for minimal overhead. However, you may find the overhead increases under each of the following conditions:
You are running System Monitor in graph view.
You have selected an option other than the default (current value) for a report view.
You are sampling at very frequent intervals (less than three seconds apart).
Many different objects and counters are selected.
Other aspects of performance tool operation that affect performance include file size and disk space taken up by log files. To reduce file size and related disk space usage, extend the update interval. Also, log to a disk other than the one you are monitoring. Frequent logging also adds demand on disk input and output (I/O).
If monitoring overhead is a concern, run only the Performance Logs and Alerts service and do not monitor using a System Monitor graph.
During remote logging, frequent updating can slow performance due to network transport. In this case, it is recommended that you log continuously on remote computers but upload logs infrequently -- for example, once a day.