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core-js vs Embed PDF Viewer

Based on 1599 and 1 real audits

View core-js details | View Embed PDF Viewer details
Metriccore-jsEmbed PDF ViewerWinner
Performance3633core-js
Accessibility8891Embed PDF Viewer
Best Practices8481core-js
SEO9192Embed PDF Viewer
Security6575Embed PDF Viewer
TTFB379ms462mscore-js
Composite7281Embed PDF Viewer
Performance
core-js
36
Embed PDF Viewer
33
Accessibility
core-js
88
Embed PDF Viewer
91
Security
core-js
65
Embed PDF Viewer
75
SEO
core-js
91
Embed PDF Viewer
92
Composite
core-js
72
Embed PDF Viewer
81

Embed PDF Viewer outperforms core-js in 4 of 7 categories, with a stronger composite score (81 vs 72). core-js leads in performance, best practices, TTFB.

When to choose core-js

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

When to choose Embed PDF Viewer

Choose Embed PDF Viewer when your primary concern is security and accessibility. Its audit data shows consistent strength in these areas across the sampled sites.

How this comparison was built

Scores are medians across 1599 audited core-js sites and 1 audited Embed PDF Viewer 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 Embed PDF Viewer?
Based on real BeaverCheck audits, core-js sites score higher on Lighthouse performance (36 vs 33 on average).
Which has better security, core-js or Embed PDF Viewer?
Embed PDF Viewer sites score higher on security analysis (75 vs 65 on average).
Which has better accessibility, core-js or Embed PDF Viewer?
Accessibility scores measured by Lighthouse WCAG 2.1 checks favor Embed PDF Viewer (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 Embed PDF Viewer?
Embed PDF Viewer 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 Embed PDF Viewer?
core-js sites show lower Time to First Byte (379 ms vs 462 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 Embed PDF Viewer 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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