Performance
Lab data — simulated mobile 42
Before 63 After
Lab metrics
Metric
Before
With Turbulence
Speed Index SI
Before: 7.9 s
After: 5.0 s -37%
First Contentful Paint FCP
Before: 4.7 s
After: 3.5 s -24%
Largest Contentful Paint LCP
Before: 13 s
After: 9.3 s -27%
Cumulative Layout Shift CLS
Before: 0.003
After: 0.000 -100%
Total Blocking Time TBT
Before: 661 ms
After: 169 ms -74%
What changed (5)
- Speculation rules prefetching Browser prefetches likely navigation targets for instant loads
- Resource hints injected Browser knows what to fetch early
- Images re-encoded to AVIF/WebP Smaller image files that look the same
- Images re-encoded to AVIF/WebP Smaller image files that look the same
- Image dimensions explicitly set Explicit dimensions prevent layout shifts
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.