91.5% of marketing agencies fail Core Web Vitals
Slow portfolios lose B2B clients to agencies with faster case studies.
Based on analysis of 103,620 marketing agencies websites
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National Benchmark Statistics
Average Mobile Score
41.3
/100Method: 75th percentile of LCP (Largest Contentful Paint), INP (Interaction to Next Paint), and CLS (Cumulative Layout Shift)
Passing Core Web Vitals
8.5
%95% CI: 8.3–8.7%
Method: Percentage of sites passing all three Core Web Vitals metrics at the 75th percentile
Sample Size
103620
sitesMethod: Identified via public business directories, search results, and local listings
Key Findings
B2B decision-makers researching agencies expect fast portfolio and case study access
Slow agency websites create credibility gaps—potential clients question technical expertise
Most agency WordPress sites have unoptimized case study galleries and client logos
Methodology
This analysis measures website performance across marketing agencies nationwide using Google PageSpeed Insights. Each site is evaluated on three Core Web Vitals metrics:
- LCP (Largest Contentful Paint): Measures loading speed—target is 2.5 seconds or less
- INP (Interaction to Next Paint): Measures responsiveness—target is 200 milliseconds or less
- CLS (Cumulative Layout Shift): Measures visual stability—target is 0.1 or less
Sites passing all three metrics at the 75th percentile are counted as "passing" Core Web Vitals. Mobile scores are prioritized as they drive search rankings and ad quality scores.
Frequently Asked Questions
Why do marketing agency websites load slowly?
Marketing agency WordPress sites typically have 12-16 plugins handling portfolios, client testimonials, project case studies, and analytics. Case study pages with embedded videos and image galleries add 3-5 seconds of load time. High-performance agency sites: 1.8 seconds.
How does website speed affect B2B agency lead generation?
B2B buyers expect technical excellence. A slow agency website creates immediate doubt about technical capabilities. Fast, optimized sites increase inquiries by 35-50%. Agencies spending $4,000+/month on demand generation could gain $1,400-$2,000/month in additional qualified leads.
How do marketing agencies compare nationally?
Our analysis of 103,000+ marketing agencies shows: Only 21% pass Core Web Vitals on mobile. Average mobile score: 42. Agencies with fast sites win 2-3x more RFPs from high-value clients.
Should my agency site showcase design or performance?
Both. High-performance agency sites can display rich case studies, interactive portfolio pieces, and embedded media while maintaining 94+ PageSpeed. Modern frameworks like Next.js enable both.
What does a high-performance agency website cost?
Agency site rebuild: $12,000-$20,000 (includes custom portfolio system, case study gallery, CMS). ROI: Fast agencies win larger contracts and close faster. Rebuild typically pays back in 3-5 months.
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