Telemetry
Also searched as: telemetry · diagtrack · data collection · usage data
What it means
The usage and diagnostic data Windows and apps send back to their makers. Turning the heaviest of it off is the cleanest debloat win.
More detail
Disabling Windows' main telemetry service has no effect on updates, stability, or your games — its honest payoff is privacy and a little less background chatter, not more FPS. It's a safe, reversible toggle. …
In the Blackbook
The deeper explanation continues inside the app. The Blackbook publishes its verdicts here — the full write-ups stay in the book, on your rig, next to your own measurements.
The Compy Blackbook holds 191 graded entries like this one, judged against your hardware — and every change it does make is reversible, with the receipt to prove it.
See Compy →