Performance
Lab data — simulated mobile 29
Before 51 After
Lab metrics
Metric
Before
With Turbulence
Speed Index SI
Before: 9.8 s
After: 12 s
First Contentful Paint FCP
Before: 4.4 s
After: 6.1 s
Largest Contentful Paint LCP
Before: 7.6 s
After: 23 s
Cumulative Layout Shift CLS
Before: 0.055
After: 0.000 -100%
Total Blocking Time TBT
Before: 2.6 s
After: 264 ms -90%
What changed (3)
- Speculation rules prefetching Browser prefetches likely navigation targets for instant loads
- Resource hints injected Browser knows what to fetch early
- Font display swap + DNS preconnect Text shows up while fonts load
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.