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Amazon CloudWatch RUM vs core-js

Based on 2 and 1599 real audits

View Amazon CloudWatch RUM details | View core-js details
MetricAmazon CloudWatch RUMcore-jsWinner
Performance4336Amazon CloudWatch RUM
Accessibility9588Amazon CloudWatch RUM
Best Practices7984core-js
SEO9691Amazon CloudWatch RUM
Security6465core-js
TTFB465ms379mscore-js
Composite7072core-js
Performance
Amazon CloudWatch RUM
43
core-js
36
Accessibility
Amazon CloudWatch RUM
95
core-js
88
Security
Amazon CloudWatch RUM
64
core-js
65
SEO
Amazon CloudWatch RUM
96
core-js
91
Composite
Amazon CloudWatch RUM
70
core-js
72

core-js outperforms Amazon CloudWatch RUM in 4 of 7 categories, with a stronger composite score (72 vs 70). Amazon CloudWatch RUM leads in performance, accessibility, SEO.

When to choose Amazon CloudWatch RUM

Choose Amazon CloudWatch RUM when your primary concern is performance and accessibility. Its audit data shows consistent strength in these areas across the sampled sites.

When to choose core-js

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

How this comparison was built

Scores are medians across 2 audited Amazon CloudWatch RUM sites and 1599 audited core-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, Amazon CloudWatch RUM or core-js?
Based on real BeaverCheck audits, Amazon CloudWatch RUM sites score higher on Lighthouse performance (43 vs 36 on average).
Which has better security, Amazon CloudWatch RUM or core-js?
core-js sites score higher on security analysis (65 vs 64 on average).
Which has better accessibility, Amazon CloudWatch RUM or core-js?
Accessibility scores measured by Lighthouse WCAG 2.1 checks favor Amazon CloudWatch RUM (95 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, Amazon CloudWatch RUM or core-js?
Amazon CloudWatch RUM sites score higher on Lighthouse SEO signals (96 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), Amazon CloudWatch RUM or core-js?
core-js sites show lower Time to First Byte (379 ms vs 465 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 Amazon CloudWatch RUM or core-js for my website?
Both platforms have trade-offs. Amazon CloudWatch RUM scores higher on overall composite score while Amazon CloudWatch RUM 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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