Performance
Lab data — simulated mobile 53
Before 41 After
Lab metrics
Metric
Before
With Turbulence
Speed Index SI
Before: 8.1 s
After: 6.2 s -23%
First Contentful Paint FCP
Before: 4.4 s
After: 3.8 s -14%
Largest Contentful Paint LCP
Before: 15 s
After: 12 s -23%
Cumulative Layout Shift CLS
Before: 0.101
After: 0.101
Total Blocking Time TBT
Before: 182 ms
After: 740 ms
What changed (8)
- 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
- Font display swap + DNS preconnect Text shows up while fonts load
- 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
- 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.