How to Audit a Competitor's Site Speed to Find an SEO Edge

SEO competitive analysis usually focuses on content, backlinks, and keywords. But there's a dimension most marketers ignore: page speed. If your competitor's Core Web Vitals are poor and yours are good, you have a ranking advantage on every keyword you compete for.

Why Competitor Speed Matters

Core Web Vitals act as a tiebreaker in Google's ranking algorithm. When two pages have similar content quality, backlinks, and relevance, the one with better CWV gets the edge.

This means:

• If competitors have poor CWV, you have an opportunity
• If competitors have good CWV, you can't afford to be slow
• If everyone in your niche is slow, speed is your easiest competitive advantage

Step 1: Identify Your Competitors' Key Pages

Focus on the pages that compete with yours directly:

• Homepage
• Top landing pages (for their main keywords)
• Product/service pages
• Blog posts ranking for your target keywords

Step 2: Run PageSpeed Insights

For each competitor page:

1. Go to pagespeed.web.dev
2. Enter the URL
3. Check mobile results (Google uses mobile-first indexing)
4. Record field data (CrUX) if available, lab data otherwise

What to Record

Metric	Their Score	Your Score	Advantage
LCP
CLS
INP
Lighthouse Mobile
TTFB

Step 3: Use CrUX for Field Data

The CrUX API gives you real user data for any origin with sufficient traffic:

curl "https://chromeuxreport.googleapis.com/v1/records:queryRecord?key=API_KEY" \
  -d '{"origin": "https://competitor.com"}'

This returns:

• p75 LCP, INP, CLS for both mobile and desktop
• Distribution histograms (what percentage Good/Needs Improvement/Poor)

Step 4: Deep Dive with WebPageTest

Run WebPageTest on competitor pages for detailed analysis:

• Full waterfall chart (see every resource loaded)
• Third-party script analysis
• Image optimization opportunities they're missing
• JavaScript execution breakdown

Step 5: Check Search Console Data

While you can't see competitors' Search Console, you can infer:

• Use Chrome DevTools to check their CWV
• Check their pages for common issues (images without dimensions, render-blocking scripts)
• Test their pages on mobile devices

Step 6: Analyze the Gap

Scenario A: Competitors Are Slow

This is your opportunity. If competitors have Poor CWV:

• Invest in making your pages lightning fast
• Use speed as a differentiator in your content
• Target keywords where your speed advantage is biggest

Scenario B: Competitors Are Fast

You need to match or exceed their performance:

• Identify which metrics they excel at
• Focus on achieving "Good" across all three CWV
• Look for other competitive advantages (content, UX)

Scenario C: The Field Is Mixed

Some competitors fast, some slow:

• Ensure you're in the "fast" group
• Look for the specific pages where speed can help you overtake

Building Your Speed Advantage

Once you've identified the gaps:

Quick Wins (1-2 Weeks)

1. Optimize images (AVIF/WebP, proper sizing)
2. Add CDN (Cloudflare free tier)
3. Defer third-party scripts
4. Add image dimensions for CLS

Medium Effort (2-4 Weeks)

1. Implement critical CSS
2. Code split JavaScript
3. Optimize server response time
4. Implement font loading strategy

Strategic (4-8 Weeks)

1. Rebuild key landing pages for performance
2. Implement edge caching
3. Set up continuous monitoring
4. Create performance testing in CI/CD

Ongoing Competitive Monitoring

Performance isn't a one-time fix. Monitor competitors quarterly:

• Re-run PageSpeed Insights on their key pages
• Check if they've improved or degraded
• Adjust your strategy accordingly

Use Speed as Marketing

If you're significantly faster than competitors:

• Mention it in your content: "Unlike other tools that take forever to load..."
• Use speed as a feature: "Built for speed"
• Show comparisons (be careful with legal/ethical boundaries)

Monitor Your Competitive Edge

BadPageSpeed helps you track your own performance continuously so your speed advantage never slips.

Maintain your speed advantage →