Performance
Lab data — simulated mobile 23
Before 37 After
Lab metrics
Metric
Before
With Turbulence
Speed Index SI
Before: 37 s
After: 20 s -45%
First Contentful Paint FCP
Before: 4.1 s
After: 3.3 s -19%
Largest Contentful Paint LCP
Before: 45 s
After: 24 s -46%
Cumulative Layout Shift CLS
Before: 0.201
After: 0.055 -73%
Total Blocking Time TBT
Before: 1.2 s
After: 925 ms -25%
What changed (2)
- Speculation rules prefetching Browser prefetches likely navigation targets for instant loads
- Resource hints injected Browser knows what to fetch early
How we measured this
- 1. We fetched your page and scored it with PageSpeed Insights (mobile, lab data).
- 2. We re-fetched it through a Turbulence preview environment that applies our transformation pipeline.
- 3. We scored the result with PageSpeed Insights again.
- 4. The deltas above are the difference — a directional estimate, not a forecast. First visits, geographic location, network conditions, and JS-rendered content all affect real-world results.