10/08/2026
Troubleshooting Windows Freeze-ups? "perfmon /rel" is Your New Best Friend
We've all been there: Your Windows PC freezes, crashes, or a program suddenly stops working, leaving you frustrated and confused. Often, the worst part is not knowing why. Windows just feels broken.
Before you restart for the third time and hope for the best, there is a powerful tool already built into Windows that can tell you exactly what went wrong—but most people have never heard of it.
It's the Reliability Monitor, and you launch it with a simple command: perfmon /rel.
What is Reliability Monitor (perfmon /rel)?
Think of the Reliability Monitor as a medical chart for your PC. It records all significant events—both successes and failures—over days, weeks, and months. While the Event Viewer exists, it's dense and aimed at experts. The Reliability Monitor is a clear, simple chart that makes the information accessible to everyone.
How to Use It:
Open the Start Menu: Just hit the Windows key.
Type: Start typing perfmon /rel (make sure there is a space after "perfmon").
Run the Command: The best match will show a chart icon. Click on it.
After a few moments, Windows will display a detailed timeline.
Deciphering the Chart:
The Main Graph: The graph shows a stability score (1-10). A high score is good; a low score means recent instability.
Icons (The Important Part):
đź”´ Red Critical Events: These are your big problems. It includes Windows itself crashing or critical hardware/software components failing.
⚠️ Yellow Warning Events: Less serious failures, usually a specific app that closed unexpectedly but didn't bring Windows down.
ℹ️ Blue Informational Events: These show major changes, like successful Windows Updates or the installation of new drivers or applications.
Why is This So Useful?
When your PC has a problem, you don't need to guess. You can look at the Reliability Monitor and immediately answer three crucial questions:
When exactly did it happen? The timeline points to the precise hour.
What specifically caused the failure? Instead of "an app crashed," you see "Firefox terminated unexpectedly" or "The graphics driver stopped responding."
Did I change something before it happened? This is the most powerful feature. You can look for a Blue Informational Event (like a driver update) just before the Red Critical Events started appearing. If you find one, you've likely found your culprit.
Actionable Information:
For red or yellow events, you can right-click on the event description in the bottom pane and select "View technical details". This won't always give a human-readable answer, but it provides a unique error code. Copy and paste that code into a Google search. You are guaranteed to find others who have had the same issue and posted a solution.
Stop Frustrated Restarting. Start Real Troubleshooting.
Don't let computer crashes mystery-solve themselves. The next time Windows freezes, don't just reach for the power button. Reach for perfmon /rel.
