Calculator
Crawl-budget ROI for prerendering
Move four sliders. Watch how cached HTML snapshots replace WRS render time, free seconds for crawling, and shorten the days required to fully cover the site.
Pages/day after prerendering
50,000
baseline: 6,000
Days to full coverage
1 d
baseline: 9 d
WRS hours saved / month
42.6 h
baseline: 0.0 h
Coverage in 30 days
100.0%
baseline: 100.0%
Estimates assume crawler render budget stays constant; gains shift freed seconds back into crawling more URLs. Real-world results vary with cache TTL, WAF behaviour, and content velocity.
Where the recovered budget comes from
Crawlers spend a fixed render budget per site. Prerendering returns cached HTML in ~50ms instead of the 1-3s a JS render typically costs. Those freed seconds shift back into URL crawling.
- Render budget per day = baseline pages crawled × JS render seconds.
- With prerendering, render time per page drops to ~50 ms — so the same budget covers far more URLs.
- Coverage in 30 days = pages crawled per day × 30 ÷ total indexable pages, capped at 100%.
- WRS hours saved scales with the share of crawler traffic that actually executes JavaScript (Googlebot, Bingbot).
Companion guides
Editorial trust
Written by ostr.io engineering team · Engineering Team. We build and run pre-rendering infrastructure for more than 200 engineering teams, which is where the numbers and code samples on this page come from.
Last updated . Editorial scope and review policy: About prerender.info.