Slow computer: first checks

Reference only. Follow your organization's IT policies and change process. Each step links its official vendor source.

Windows

1. Scope: Slow at everything or one app? Since when? Any recent update or install?
2. Local: What is using CPU and memory? tasklist Lists running processes. Task Manager shows the same with usage. source
3. Local: Check system files (admin prompt). sfc /scannow Reports and repairs protected system files. source
4. Vendor guide: Microsoft: Tips to improve PC performance source

Mac

1. Built-in check: Activity Monitor shows CPU, memory, energy, disk and network use per app. source

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