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core-js vs Fast Bundle

Based on 1600 and 1 real audits

View core-js details | View Fast Bundle details
Metriccore-jsFast BundleWinner
Performance3528core-js
Accessibility8796Fast Bundle
Best Practices8381core-js
SEO91100Fast Bundle
Security6575Fast Bundle
TTFB378ms101msFast Bundle
Composite7272Tie
Performance
core-js
35
Fast Bundle
28
Accessibility
core-js
87
Fast Bundle
96
Security
core-js
65
Fast Bundle
75
SEO
core-js
91
Fast Bundle
100
Composite
core-js
72
Fast Bundle
72

Fast Bundle outperforms core-js in 4 of 7 categories, with a stronger composite score (72 vs 72). core-js leads in performance, best practices.

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 Fast Bundle

Choose Fast Bundle when your primary concern is server response time and security. Its audit data shows consistent strength in these areas across the sampled sites.

How this comparison was built

Scores are medians across 1600 audited core-js sites and 1 audited Fast Bundle 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 Fast Bundle?
Based on real BeaverCheck audits, core-js sites score higher on Lighthouse performance (35 vs 28 on average).
Which has better security, core-js or Fast Bundle?
Fast Bundle sites score higher on security analysis (75 vs 65 on average).
Which has better accessibility, core-js or Fast Bundle?
Accessibility scores measured by Lighthouse WCAG 2.1 checks favor Fast Bundle (96 vs 87). 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 Fast Bundle?
Fast Bundle sites score higher on Lighthouse SEO signals (100 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 Fast Bundle?
Fast Bundle sites show lower Time to First Byte (101 ms vs 378 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 Fast Bundle 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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