All commands and Lenses
Lens · Make it hold up
optimize
Make it feel fast on the user's real phone, then prove it.
Measures first, fixes the biggest bottleneck, and measures again. Judges speed by what people see: when content appears, whether it jumps, whether taps answer at once.
When to use it
- It raises
- Robustness & performance
- Skip it when
- Nothing is measurably slow. It never trades accessibility or quality for a number.
Try it
/pristine polish optimize the home page on mobileReports LCP, layout shift and interaction delay before and after.
What it changes
| Before | After |
|---|---|
| 1.8MB hero PNG, LCP 4.1s on mobile | AVIF at the rendered size with high fetch priority, LCP 1.9s |
| Font swap shifts the headline by 40px | Metric-matched fallback, no visible shift |