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core-js vs Google Optimize

Based on 1582 and 14 real audits

View core-js details | View Google Optimize details
Metriccore-jsGoogle OptimizeWinner
Performance3637Google Optimize
Accessibility8883core-js
Best Practices8482core-js
SEO9187core-js
Security6564core-js
TTFB374ms366msGoogle Optimize
Composite7271core-js
Performance
core-js
36
Google Optimize
37
Accessibility
core-js
88
Google Optimize
83
Security
core-js
65
Google Optimize
64
SEO
core-js
91
Google Optimize
87
Composite
core-js
72
Google Optimize
71

core-js outperforms Google Optimize in 5 of 7 categories, with a stronger composite score (72 vs 71). Google Optimize leads in performance, TTFB.

When to choose core-js

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

When to choose Google Optimize

Choose Google Optimize 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 14 audited Google Optimize 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 Google Optimize?
Based on real BeaverCheck audits, Google Optimize sites score higher on Lighthouse performance (37 vs 36 on average).
Which has better security, core-js or Google Optimize?
core-js sites score higher on security analysis (65 vs 64 on average).
Which has better accessibility, core-js or Google Optimize?
Accessibility scores measured by Lighthouse WCAG 2.1 checks favor core-js (88 vs 83). 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 Google Optimize?
core-js sites score higher on Lighthouse SEO signals (91 vs 87 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 Google Optimize?
Google Optimize sites show lower Time to First Byte (366 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 Google Optimize for my website?
Both platforms have trade-offs. Google Optimize 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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