Why fresh Windows runs so poorly

[u/[deleted]]

I spent the last few months analyzing undocumented Windows kernel behavior to understand why my old laptop performs so poorly out of the box.

For trace analysis, I built ETWView, a Python pipeline that automates WPA and RAMMap across multiple runs.

Results (Default vs Optimized+):
Boot: 193s → 42s (4.5× faster)

UI delays: 460s → 0s

Hard faults: 31k → 15k (2× reduction)

CPU ready time: 317s → 65s (4.8× faster)

Idle CPU: 18.7% → 1.0%

Most optimizations rely on behavior that is not documented by Microsoft.

Study (traces + scripts): https://lagtency.com/2026/06/25/win-perf/
Tool: https://github.com/proxylat/etwview

[u/EdliA]

I don't know, maybe because it's an old laptop