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Fastly vs Google Tag Manager

Based on 380 and 2505 real audits

View Fastly details | View Google Tag Manager details
MetricFastlyGoogle Tag ManagerWinner
Performance4640Fastly
Accessibility9188Fastly
Best Practices8986Fastly
SEO9291Fastly
Security6665Fastly
TTFB148ms372msFastly
Composite7473Fastly
Performance
Fastly
46
Google Tag Manager
40
Accessibility
Fastly
91
Google Tag Manager
88
Security
Fastly
66
Google Tag Manager
65
SEO
Fastly
92
Google Tag Manager
91
Composite
Fastly
74
Google Tag Manager
73

Fastly outperforms Google Tag Manager in 7 of 7 categories, with a stronger composite score (74 vs 73). Google Tag Manager leads in no categories.

When to choose Fastly

Choose Fastly 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 Google Tag Manager

Google Tag Manager doesn't clearly lead Fastly 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 380 audited Fastly sites and 2505 audited Google Tag Manager 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, Fastly or Google Tag Manager?
Based on real BeaverCheck audits, Fastly sites score higher on Lighthouse performance (46 vs 40 on average).
Which has better security, Fastly or Google Tag Manager?
Fastly sites score higher on security analysis (66 vs 65 on average).
Which has better accessibility, Fastly or Google Tag Manager?
Accessibility scores measured by Lighthouse WCAG 2.1 checks favor Fastly (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, Fastly or Google Tag Manager?
Fastly 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), Fastly or Google Tag Manager?
Fastly sites show lower Time to First Byte (148 ms vs 372 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 Fastly or Google Tag Manager for my website?
Both platforms have trade-offs. Fastly scores higher on overall composite score while Fastly 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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