Performance
Lab data — simulated mobile 60
Before 62 After
Lab metrics
Metric
Before
With Turbulence
Speed Index SI
Before: 7.2 s
After: 6.8 s -7%
First Contentful Paint FCP
Before: 3.8 s
After: 3.6 s -4%
Largest Contentful Paint LCP
Before: 19 s
After: 8.1 s -58%
Cumulative Layout Shift CLS
Before: 0.061
After: 0.061
Total Blocking Time TBT
Before: 10 ms
After: 14 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.