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core-js vs PDF.js

Based on 1582 and 3 real audits

View core-js details | View PDF.js details
Metriccore-jsPDF.jsWinner
Performance3620core-js
Accessibility8891PDF.js
Best Practices8478core-js
SEO9192PDF.js
Security6565Tie
TTFB374ms275msPDF.js
Composite7271core-js
Performance
core-js
36
PDF.js
20
Accessibility
core-js
88
PDF.js
91
Security
core-js
65
PDF.js
65
SEO
core-js
91
PDF.js
92
Composite
core-js
72
PDF.js
71

core-js and PDF.js are closely matched, each leading in different categories. core-js has a composite score of 72 while PDF.js scores 71.

When to choose core-js

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

When to choose PDF.js

Choose PDF.js when your primary concern is server response time and accessibility. 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 3 audited PDF.js 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 PDF.js?
Based on real BeaverCheck audits, core-js sites score higher on Lighthouse performance (36 vs 20 on average).
Which has better security, core-js or PDF.js?
core-js sites score higher on security analysis (65 vs 65 on average).
Which has better accessibility, core-js or PDF.js?
Accessibility scores measured by Lighthouse WCAG 2.1 checks favor PDF.js (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 PDF.js?
PDF.js 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 PDF.js?
PDF.js 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 PDF.js for my website?
Both platforms have trade-offs. core-js 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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