High CPU load after Windows 24H2 update?
After installing the Windows 24H2 update, Windows Firewall & Security may not be fully reconfigured, which can result in unusual high CPU load.
Try the following steps:
⚠️ Warning: After this procedure, Remote Desktop may stop working and may need to be re‑enabled.
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Firewall:
Select “Restore default policies” -
Windows Security:
Go to “Firewall & network protection” → switch it off once → then on again
Last update on 2026-03-23 by Rolf Haenggi.