Windows collects significant telemetry by default. Beyond the privacy concern, the collection processes consume CPU and disk I/O. Here's what to disable and how.
Advertising ID
Windows assigns each PC an advertising ID for targeted ads in apps. No gaming benefit.
HKCU\SOFTWARE\Microsoft\Windows\CurrentVersion\AdvertisingInfo
Enabled = 0
Activity History
Windows tracks which apps you open, files you access, and websites you visit (across devices if signed in with Microsoft account).
Settings → Privacy → Activity history → uncheck everything.
Registry:
HKLM\SOFTWARE\Policies\Microsoft\Windows\System
PublishUserActivities = 0
EnableActivityFeed = 0
Tailored Experiences
Uses diagnostic data to show suggestions and recommendations:
HKCU\SOFTWARE\Microsoft\Windows\CurrentVersion\Privacy
TailoredExperiencesWithDiagnosticDataEnabled = 0
App launch tracking
Windows tracks which apps you launch to improve Start menu suggestions:
HKCU\SOFTWARE\Microsoft\Windows\CurrentVersion\Explorer\Advanced
Start_TrackProgs = 0
Location
Unless you use location-aware apps, disable it:
Settings → Privacy → Location → turn off.
Feedback frequency
Windows periodically asks for feedback. Set to Never:
HKCU\SOFTWARE\Microsoft\Siuf\Rules
NumberOfSIUFInPeriod = 0
PeriodInNanoSeconds = 0
All of these are in IzanagiOP's Safe Optimizations privacy section. https://terweb.lt/
