Windows
Slow computer with high CPU use; installed updates and restarted
The computer became slow over a few days, with about 80% CPU shown in Task Manager even though only a few apps were open and Settings was slow to load. Important updates were installed and the computer was restarted to apply them.
Killed once by someone from XL.net, on 2025-12-09.
Affects
Apps
- Teams
- Outlook
- Edge
- Windows Settings
What you see
- Task Manager showed about 80% CPU with only a few processes open
- Windows Settings took about 20 seconds to appear
- The slowness continued after reboots before the updates were applied
Why it happens
Suspected Suspected pending updates were contributing to the slowness; the ticket did not establish a definitive root cause.
When it shows up
A Windows computer feels broadly slow, with high CPU usage in Task Manager even though only a few apps are open.
You are in this case if:
- Task Manager shows roughly 80% CPU with few visible processes
- Windows Settings is slow to open
1 fix below
The steps that killed it
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Someone from XL.net killed this on a Windows computer on 2025-12-09. It is written up from that one repair, so it cites no outside page.