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Google Tag Manager vs Lozad.js

Based on 2504 and 12 real audits

View Google Tag Manager details | View Lozad.js details
MetricGoogle Tag ManagerLozad.jsWinner
Performance4040Tie
Accessibility8886Google Tag Manager
Best Practices8686Tie
SEO9187Google Tag Manager
Security6564Google Tag Manager
TTFB372ms441msGoogle Tag Manager
Composite7371Google Tag Manager
Performance
Google Tag Manager
40
Lozad.js
40
Accessibility
Google Tag Manager
88
Lozad.js
86
Security
Google Tag Manager
65
Lozad.js
64
SEO
Google Tag Manager
91
Lozad.js
87
Composite
Google Tag Manager
73
Lozad.js
71

Google Tag Manager outperforms Lozad.js in 5 of 7 categories, with a stronger composite score (73 vs 71). Lozad.js leads in no categories.

When to choose Google Tag Manager

Choose Google Tag Manager when your primary concern is server response time and SEO. Its audit data shows consistent strength in these areas across the sampled sites.

When to choose Lozad.js

Lozad.js doesn't clearly lead Google Tag Manager in any category on the sampled sites — pick it based on developer experience, ecosystem, or existing team skills rather than the audit scores.

How this comparison was built

Scores are medians across 2504 audited Google Tag Manager sites and 12 audited Lozad.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 →

FAQ

Which is faster, Google Tag Manager or Lozad.js?
Based on real BeaverCheck audits, Google Tag Manager sites score higher on Lighthouse performance (40 vs 40 on average).
Which has better security, Google Tag Manager or Lozad.js?
Google Tag Manager sites score higher on security analysis (65 vs 64 on average).
Which has better accessibility, Google Tag Manager or Lozad.js?
Accessibility scores measured by Lighthouse WCAG 2.1 checks favor Google Tag Manager (88 vs 86). 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, Google Tag Manager or Lozad.js?
Google Tag Manager sites score higher on Lighthouse SEO signals (91 vs 87 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), Google Tag Manager or Lozad.js?
Google Tag Manager sites show lower Time to First Byte (372 ms vs 441 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 Google Tag Manager or Lozad.js for my website?
Both platforms have trade-offs. Google Tag Manager scores higher on overall composite score while Google Tag Manager 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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