MPO (Multi-Plane Overlay)
Also searched as: mpo · multi plane overlay · multi-plane overlay · overlaytestmode
What it means
A Windows feature that lets the screen composite layers (like a video and a desktop) more efficiently. On some setups it has a bug that causes flicker or stutter.
More detail
When it misbehaves — most often on multi-monitor or VRR setups — turning it off is a legitimate fix. The catch: if you don't have the flicker symptom, turning it off does nothing for you, so it's a fix, not a free upgrade. It's a reversible registry change.
The Compy Blackbook holds 174 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 →