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core-js vs Varnish

Based on 1582 and 441 real audits

View core-js details | View Varnish details
Metriccore-jsVarnishWinner
Performance3644Varnish
Accessibility8889Varnish
Best Practices8489Varnish
SEO9191Tie
Security6565Tie
TTFB374ms202msVarnish
Composite7274Varnish
Performance
core-js
36
Varnish
44
Accessibility
core-js
88
Varnish
89
Security
core-js
65
Varnish
65
SEO
core-js
91
Varnish
91
Composite
core-js
72
Varnish
74

Varnish outperforms core-js in 5 of 7 categories, with a stronger composite score (74 vs 72). core-js leads in no categories.

When to choose core-js

core-js doesn't clearly lead Varnish in any category on the sampled sites — pick it based on developer experience, ecosystem, or existing team skills rather than the audit scores.

When to choose Varnish

Choose Varnish 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 441 audited Varnish 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 →

FAQ

Which is faster, core-js or Varnish?
Based on real BeaverCheck audits, Varnish sites score higher on Lighthouse performance (44 vs 36 on average).
Which has better security, core-js or Varnish?
core-js sites score higher on security analysis (65 vs 65 on average).
Which has better accessibility, core-js or Varnish?
Accessibility scores measured by Lighthouse WCAG 2.1 checks favor Varnish (89 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 Varnish?
core-js sites score higher on Lighthouse SEO signals (91 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 Varnish?
Varnish sites show lower Time to First Byte (202 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 Varnish for my website?
Both platforms have trade-offs. Varnish 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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