The problem seems to have disappeared.
Microsoft Windows Search Using CPU
Typically after booting my PC the total CPU usage, as reported by Task Manager, settles down to <5%. Since yesterday's Windows update three processes have been sitting at the top of the CPU list for hours: Microsoft Windows Search Protocol Host, Microsoft Windows Search Indexer and Microsoft Windows Search Filter Host. Is this expected? I guess I wouldn't mind so much except for the CPU loudly whining.
Windows for home | Windows 10 | Performance and system failures
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Anonymous
2022-06-22T13:13:34+00:00 -
Anonymous
2022-06-17T16:38:58+00:00 Try restart your PC and see if the problem persists?
Check for Windows Update and see if there is any pending updates?