Over the years I've discovered a lot of places where Windows 10 stores junk which almost never gets cleaned up automatically and which is safe to delete. Not listing %TEMP% which is obviously temporary.

*** 2021-05-12 02:48:59 C:\ProgramData\Microsoft\Windows Security Health\Logs C:\Windows\Logs\{CBS|DISM} C:\Windows\servicing\LCU\ C:\Windows\SoftwareDistribution\Download\ C:\Windows\Temp\ C:\Windows\ServiceProfiles\NetworkService\AppData\Local\Microsoft\Windows\DeliveryOptimization\Logs *** 2021-05-29 05:15:41 C:\ProgramData\Microsoft\Search\Data\Applications\Windows\GatherLogs\SystemIndex\ *** 2020-01-08 20:21:11 HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\UFH\SHC *** 2021-06-27 06:23:20 C:\ProgramData\USOShared\Logs\User C:\ProgramData\USOShared\Logs\System C:\Windows\System32\config\TxR\ HKEY_CURRENT_USER\Software\Microsoft\Internet Explorer\LowRegistry\Audio\PolicyConfig\PropertyStore *** 2022-02-22 22:14:46 rem disable logging to C:\ProgramData\Microsoft\Windows\wfp\wfpdiag.etl rem https://social.technet.microsoft.com/Forums/en-US/win10itprogeneral/thread/7d0d2721-35ea-418e-9e7c-0bef1366a25f (wfpdiag.etl disk usage, constantly writing) netsh wfp set options netevents=off *** 2022-03-17 02:50:13 Performance Monitor -> UserNotPresentTraceSession. Fix: Image *** 2022-04-17 22:20:00 C:\Windows\System32\SleepStudy\ScreenOn To disable it: schtasks /change /tn "\microsoft\windows\power efficiency diagnostics\analyzesystem" /disable You can also manually go to the task by using these steps: 1. Start > Windows Administrative Tools > Task Scheduler 2. Then expand the tree down: 3. Task Scheduler Library > Microsoft > Windows > Power Efficiency Diagnostics *** 2023-07-15 16:01:00 Disable Ready Boot (ReadyBoot).