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core-js vs Instant.Page

Based on 1582 and 5 real audits

View core-js details | View Instant.Page details
Metriccore-jsInstant.PageWinner
Performance3650Instant.Page
Accessibility8891Instant.Page
Best Practices8479core-js
SEO9192Instant.Page
Security6566Instant.Page
TTFB374ms275msInstant.Page
Composite7273Instant.Page
Performance
core-js
36
Instant.Page
50
Accessibility
core-js
88
Instant.Page
91
Security
core-js
65
Instant.Page
66
SEO
core-js
91
Instant.Page
92
Composite
core-js
72
Instant.Page
73

Instant.Page outperforms core-js in 6 of 7 categories, with a stronger composite score (73 vs 72). core-js leads in best practices.

When to choose core-js

Choose core-js when your primary concern is best practices. Its audit data shows consistent strength in these areas across the sampled sites.

When to choose Instant.Page

Choose Instant.Page when your primary concern is server response time and performance. Its audit data shows consistent strength in these areas across the sampled sites.

How this comparison was built

Scores are medians across 1582 audited core-js sites and 5 audited Instant.Page sites in the BeaverCheck database. Every audit runs the same 100+ checks — Lighthouse performance, security headers, accessibility, SEO, server response time — against a real URL. No vendor input, no sponsorship, no affiliate links. Read the full methodology →

Small sample: one or both technologies have fewer than 10 audited sites. Treat these numbers as directional — medians stabilize around 20–30 audits per side.

FAQ

Which is faster, core-js or Instant.Page?
Based on real BeaverCheck audits, Instant.Page sites score higher on Lighthouse performance (50 vs 36 on average).
Which has better security, core-js or Instant.Page?
Instant.Page sites score higher on security analysis (66 vs 65 on average).
Which has better accessibility, core-js or Instant.Page?
Accessibility scores measured by Lighthouse WCAG 2.1 checks favor Instant.Page (91 vs 88). Both technologies can be made fully accessible with care — the difference reflects common patterns in the sampled sites, not inherent platform limits.
Which is better for SEO, core-js or Instant.Page?
Instant.Page sites score higher on Lighthouse SEO signals (92 vs 91 on average), which cover meta tags, crawlability, mobile friendliness, and structured data. Content strategy and backlinks still matter more than platform choice for ranking.
Which has faster server response (TTFB), core-js or Instant.Page?
Instant.Page sites show lower Time to First Byte (275 ms vs 374 ms on average). TTFB depends heavily on hosting and CDN setup rather than the technology itself, but the sampled sites suggest a meaningful difference in common deployment patterns.
Should I choose core-js or Instant.Page for my website?
Both platforms have trade-offs. Instant.Page scores higher on overall composite score while core-js may excel in metrics you care about most. Run a free BeaverCheck audit on a real site using each to compare the metrics relevant to your use case.
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