Favour the foreground app (short quanta)
Sets Win32PrioritySeparation to 0x26: short, variable quanta with a foreground boost.
Applying it needs Nexus Pro. Every plan can read it here and undo it in Restore Center. Compare plans
What it changes
HKLM\SYSTEM\CurrentControlSet\Control\PriorityControl\Win32PrioritySeparation = 38
Before anything is written, the review screen shows this setting's current value on your PC next to the new one.
Why it helps
Gives the active window (your game) a larger share of CPU time slices.
Trade-offs
Windows' default already favours the foreground on desktops. Background tasks (streaming, encoding) may suffer.
Evidence
Limited evidence means: popular, but gains are rarely measurable. Expected impact is small (1 of 3): how much it can matter when this is actually the bottleneck on your PC, not a promised gain.
Gains from this tweak are rarely measurable on modern Windows, so it is never recommended or applied in bulk. If you try it, measure before and after with the Benchmark and keep it only if it helps.
Is it in a pack?
No. Packs only contain Safe tweaks, and this one is labelled Caution.
How to undo
Switch the tweak off in Nexus, or open Restore Center and restore this change (or choose Undo last change). Nexus writes back the original value it recorded before applying, not a generic default, then reads it back to confirm.