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Open Reliability Monitor from the Command Line

perfmon /rel opens the stability timeline that shows which apps or drivers crash and when.

WindowssystemDiagnosticsLow risk
Run `perfmon /rel` to open Reliability Monitor and review days with application crashes, hangs, or Windows failures.

01Command

Command
$ perfmon /rel

02What it does

Reliability Monitor charts your PC's stability day by day and records application crashes, hangs, driver failures, and installs. It is often the fastest way to spot which program or update coincided with problems that started recently. Double-click any event to read its detail and use the links to view saved problem reports.

03Risk

RiskLow risk
RequirementsWindows 10/11; no elevation needed.

04Undo

✓No undo needed — this command does not change persistent state.

05Sources

  • Start Reliability Monitor
    Microsoft Learn · vendor-doc · 2026-09-17
    Evidence: Instructions state you can start Reliability Monitor "in its own window by typing perfmon /rel".
  • perfmon
    Microsoft Learn · vendor-doc · 2026-09-17
    Evidence: Lists the /rel switch that starts Reliability Monitor with a specific report.

Last verified: 2026-09-19 · Category: System & Settings

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