Performance
Lab data — simulated mobile 48
Before 55 After
Lab metrics
Metric
Before
With Turbulence
Speed Index SI
Before: 5.5 s
After: 2.4 s -56%
First Contentful Paint FCP
Before: 2.6 s
After: 2.1 s -16%
Largest Contentful Paint LCP
Before: 6.3 s
After: 5.6 s -11%
Cumulative Layout Shift CLS
Before: 0.504
After: 0.564
Total Blocking Time TBT
Before: 32 ms
After: 15 ms -53%
What changed (6)
- Speculation rules prefetching Browser prefetches likely navigation targets for instant loads
- Resource hints injected Browser knows what to fetch early
- Render-blocking resources deferred Page paints before stylesheets finish
- 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
- CSS and JavaScript minified and edge-cached Stylesheets and scripts load faster with smaller, cached files
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.