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core-js vs ExtJS

Based on 1687 and 2 real audits

View core-js details | View ExtJS details
Metriccore-jsExtJSWinner
Performance3642ExtJS
Accessibility8869core-js
Best Practices8486ExtJS
SEO9195ExtJS
Security6672ExtJS
TTFB396ms103msExtJS
Composite7377ExtJS
Performance
core-js
36
ExtJS
42
Accessibility
core-js
88
ExtJS
69
Security
core-js
66
ExtJS
72
SEO
core-js
91
ExtJS
95
Composite
core-js
73
ExtJS
77

ExtJS outperforms core-js in 6 of 7 categories, with a stronger composite score (77 vs 73). core-js leads in accessibility.

When to choose core-js

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

When to choose ExtJS

Choose ExtJS 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 1687 audited core-js sites and 2 audited ExtJS 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 ExtJS?
Based on real BeaverCheck audits, ExtJS sites score higher on Lighthouse performance (42 vs 36 on average).
Which has better security, core-js or ExtJS?
ExtJS sites score higher on security analysis (72 vs 66 on average).
Which has better accessibility, core-js or ExtJS?
Accessibility scores measured by Lighthouse WCAG 2.1 checks favor core-js (88 vs 69). 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 ExtJS?
ExtJS sites score higher on Lighthouse SEO signals (95 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 ExtJS?
ExtJS sites show lower Time to First Byte (103 ms vs 396 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 ExtJS for my website?
Both platforms have trade-offs. ExtJS 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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