Reduce unused JavaScript
Estimated savings: 420 ms 84 KB
Split the bundle and defer features that are not needed immediately.
The initial bundle includes code that is not required for the first view.
Sample report · illustrative data
Performance score
74
Lab measurement out of 100
About this run
- Engine
- Michal’s Web Toolkit & Google PageSpeed Insights
- Lighthouse
- sample
- Collected
- 9/5/2026, 12:00:00 AM
- Device profile
- mobile
Lab metrics
A controlled Lighthouse test. Values can vary between runs and are separate from real-user Core Web Vitals.
- First Contentful Paint
- 1.7 s
- Good
- Largest Contentful Paint
- 3.2 s
- Needs improvement
- Total Blocking Time
- 310 ms
- Needs improvement
- Cumulative Layout Shift
- 0.08
- Good
- Speed Index
- 3.9 s
- Needs improvement
Real-user experience
Chrome UX Report data for this origin. These values describe real visits, not this lab run.
- Largest Contentful Paint
- 2.7 s
- Needs improvement
- Interaction to Next Paint
- 180 ms
- Good
- Cumulative Layout Shift
- 0.09
- Good
Highest-impact improvements
Estimated savings are directional and should not be added together.