Tyler
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The real cause of "only the first couple of clicks were captured while on
power saving mode": Windows Power Throttling (EcoQoS) CPU-starves background
processes under a power-saving plan. The low-level WH_MOUSE_LL hook lives in
the spawned PowerShell watcher; when its callback is starved past the system
LowLevelHooksTimeout, Windows silently stops delivering mouse events to it —
the process keeps running (so no exit/crash, no fallback to interval capture
fires), it just misses clicks, and those clicks never become steps.
The previous powerSaveBlocker('prevent-app-suspension') only maps to
SetThreadExecutionState, which blocks system sleep but does NOT opt a process
out of EcoQoS, so it couldn't fix this.
Have the watcher process opt itself out of execution-speed throttling via
SetProcessInformation(ProcessPowerThrottling, ...) and raise itself to
HIGH_PRIORITY_CLASS at startup, so the hook callback always runs at full
speed and every click is delivered regardless of the laptop's power mode.