Performance
Lab data — simulated mobile 77
Before 88 After
Lab metrics
Metric
Before
With Turbulence
Speed Index SI
Before: 5.6 s
After: 2.6 s -53%
First Contentful Paint FCP
Before: 2.6 s
After: 1.7 s -35%
Largest Contentful Paint LCP
Before: 4.4 s
After: 3.8 s -14%
Cumulative Layout Shift CLS
Before: 0.004
After: 0.001 -75%
Total Blocking Time TBT
Before: 8 ms
After: 9 ms
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.