CPU Throttle Impact

v1.0.0

Predict score change for a CPU class (4× / 6× slowdown) given baseline timings.

Current Lighthouse Score (1–100)

CPU Throttle

Result

CPU Throttle Impact Estimate

Baseline score:    75 (unthrottled)
Throttle:          4x
Predicted score:   64 — Needs Improvement
Score drop:        -11 points

Lighthouse uses 4× throttle on mobile preset.
WebPageTest / field data often show 6-10× mobile CPUs.

To improve:
  • Reduce JS execution time (code-split, defer, tree-shake)
  • Reduce main thread blocking tasks > 50ms
  • Use Web Workers for heavy computation