Performance
Lab data — simulated mobile 41
Before 49 After
Lab metrics
Metric
Before
With Turbulence
Speed Index SI
Before: 9.8 s
After: 4.2 s -57%
First Contentful Paint FCP
Before: 2.3 s
After: 1.1 s -52%
Largest Contentful Paint LCP
Before: 23 s
After: 11 s -53%
Cumulative Layout Shift CLS
Before: 0.002
After: 0.309
Total Blocking Time TBT
Before: 1.0 s
After: 367 ms -65%
What changed (6)
- picperf-banner Improves page load speed and visitor experience.
- 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
- 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.