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Microsoft IIS vs Windows Server

Based on 72 and 79 real audits

View Microsoft IIS details | View Windows Server details
MetricMicrosoft IISWindows ServerWinner
Performance4551Windows Server
Accessibility8788Windows Server
Best Practices8587Windows Server
SEO9092Windows Server
Security6769Windows Server
TTFB547ms530msWindows Server
Composite7274Windows Server
Performance
Microsoft IIS
45
Windows Server
51
Accessibility
Microsoft IIS
87
Windows Server
88
Security
Microsoft IIS
67
Windows Server
69
SEO
Microsoft IIS
90
Windows Server
92
Composite
Microsoft IIS
72
Windows Server
74

Windows Server outperforms Microsoft IIS in 7 of 7 categories, with a stronger composite score (74 vs 72). Microsoft IIS leads in no categories.

When to choose Microsoft IIS

Microsoft IIS doesn't clearly lead Windows Server in any category on the sampled sites — pick it based on developer experience, ecosystem, or existing team skills rather than the audit scores.

When to choose Windows Server

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

How this comparison was built

Scores are medians across 72 audited Microsoft IIS sites and 79 audited Windows Server 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, Microsoft IIS or Windows Server?
Based on real BeaverCheck audits, Windows Server sites score higher on Lighthouse performance (51 vs 45 on average).
Which has better security, Microsoft IIS or Windows Server?
Windows Server sites score higher on security analysis (69 vs 67 on average).
Which has better accessibility, Microsoft IIS or Windows Server?
Accessibility scores measured by Lighthouse WCAG 2.1 checks favor Windows Server (88 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, Microsoft IIS or Windows Server?
Windows Server sites score higher on Lighthouse SEO signals (92 vs 90 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), Microsoft IIS or Windows Server?
Windows Server sites show lower Time to First Byte (530 ms vs 547 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 Microsoft IIS or Windows Server for my website?
Both platforms have trade-offs. Windows Server scores higher on overall composite score while Microsoft IIS 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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