Booster Page Speed Optimizer vs Seal Subscriptions
Head-to-head usage across the sites we track.
Top sites by authority
Booster Page Speed Optimizer · Seal Subscriptions · how many of each technology's sites sit in the web's highest authority tiers
Open Page Rank scores 0 to 10 from the open web link graph; 9+ covers only a few hundred domains worldwide.
By country
Booster Page Speed Optimizer · Seal Subscriptions · share of sites in each country using one or the other
United States
2,475
5,335
United Kingdom
1,012
1,797
India
1,230
823
Canada
750
1,280
Germany
736
979
Australia
631
1,054
France
628
649
Italy
606
351
Audience countries from the Chrome UX Report, top markets of either technology.
Real user performance
| Metric | Booster Page Speed Optimizer | Seal Subscriptions |
|---|---|---|
| LCP | 1.7 s | 1.5 s |
| INP | 100 ms | 75 ms |
| CLS | 0 | 0 |
| TTFB | 500 ms | 500 ms |
Median site's p75 values from the Chrome UX Report, Aug 2026. Lower is better; green meets Google's "good" threshold. This describes the sites that use each technology, not the technology's own overhead.
Sites that switched
Domains that dropped one technology and adopted the other within about a year, data nobody else gives away free.
Booster Page Speed Optimizer to Seal Subscriptions
| Domain | When |
|---|---|
| mykasher.com | Apr 2026 |
| earthbreath.co.uk | Mar 2026 |
| rpwindowfilms.com | Dec 2025 |
| onni.de | Oct 2025 |
All Booster Page Speed Optimizer sites · All Seal Subscriptions sites