We recommend that you read about the PerformanceGuard web interface (that's the web-based user interface where you view performance data and configure PerformanceGuard).
If you're new to PerformanceGuard, also read our Get Started guides for administrators or users.
If PerformanceGuard has already collected some performance data for you, we also recommend that you read I Want to Know ... (it's about how to interpret your performance data) and When Is Performance Good or Bad?