Performance
Lab data — simulated mobile 59
Before 58 After
Lab metrics
Metric
Before
With Turbulence
Speed Index SI
Before: 7.1 s
After: 7.0 s -2%
First Contentful Paint FCP
Before: 3.0 s
After: 2.8 s -8%
Largest Contentful Paint LCP
Before: 18 s
After: 13 s -29%
Cumulative Layout Shift CLS
Before: 0.003
After: 0.002 -33%
Total Blocking Time TBT
Before: 225 ms
After: 276 ms
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.