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How to Speed Up Blogger Site for Core Web Vitals

Emxymes 11:14

 Slow Blogger site = Google demotes you. Failing Core Web Vitals = AdSense RPM drops 40%.

In this tutorial, you'll fix LCP, CLS, and INP to pass Core Web Vitals. Follow along and you'll rank higher + earn more in 2025.

Step 1: Check Your Blogger Core Web Vitals Score

Can't fix it if you don't measure it. Test first.

  1. Go to pagespeed.web.dev → Enter your blog URL → Analyze
  2. 3 metrics to pass: LCP under 2.5s, CLS under 0.1, INP under 200ms
  3. Search Console → Core Web Vitals → See all failing URLs
  4. Goal: 75% of visits must pass. Mobile score matters most

Image: PageSpeed Insights showing failed Core Web Vitals

Step 2: Fix Largest Contentful Paint LCP Under 2.5s

LCP = time for main image or text to load. Usually your featured image.

ProblemFix in BloggerTime Saved
Huge imagesCompress to under 100KB. Use WebP format. 1200px max width1-3s
Slow fontsTheme → Customize → Fonts → Use "Arial" or "System fonts" only0.5-1s
Heavy themeSwitch to "Contempo" or "Notable" theme. Avoid custom themes1-2s
Above-fold adsAdSense → Auto ads → Turn OFF "Header ads"1-4s

LCP Fix Code: Add above </head> in Theme HTML

<link rel="preload" as="image" href="YOUR-FEATURED-IMAGE-URL">
<link rel="preconnect" href="https://fonts.gstatic.com" crossorigin>

Step 3: Fix Cumulative Layout Shift CLS Under 0.1

CLS = page elements jumping around. Ads, images without size cause it.

  1. Fix 1: Add width/height to all images
    <img src="image.jpg" width="800" height="600" alt="description">
  2. Fix 2: Reserve space for AdSense ads
    <div style="min-height:280px">AD CODE HERE</div>
  3. Fix 3: Don't use web fonts Theme → Customize → Fonts → Set all to "Arial" or "Georgia"
  4. Fix 4: Remove animated widgets Delete sliders, counters, animations from Layout

Step 4: Fix Interaction to Next Paint INP Under 200ms

INP = delay when user clicks button. Heavy JavaScript kills it.

  1. Delete gadgets: Layout → Remove HTML/JavaScript, Followers, Blog Archive widgets
  2. Defer JavaScript: Theme → Edit HTML → Find <script tags → Add defer
    <script src="file.js" defer></script>
  3. Reduce ads: AdSense → Max 3 ads per page. Remove Auto Ads vignette + anchor ads
  4. Lazy load images: Add loading="lazy" to img tags below fold

Step 5: Blogger Speed Optimization Checklist 2025

Paste this CSS above ]]></b:skin> in Theme HTML to fix multiple issues:

/* Speed Fixes 2025 */
.post-body img {max-width: 100%; height: auto;} /* Fix CLS */
iframe, .widget iframe {max-width: 100%;} /* Responsive embeds */
.sidebar, .popular-posts {display: none;} /* Remove heavy widgets on mobile */
@media (max-width:768px){
.share-buttons, .related-posts img {loading: lazy;} /* Lazy load */
}
  1. Remove Blogger CSS/JS: Theme → Edit HTML → Delete lines with widget_css_bundle if not used
  2. Use system fonts: Faster than Google Fonts by 500ms
  3. Compress images: tinypng.com → All images under 100KB → Re-upload
  4. Test again: pagespeed.web.dev → Must show "Passed" in green

Bad practice to avoid: Adding 10+ gadgets, social counters, live chat. Each adds 200ms load time. Core Web Vitals fail = rankings drop.

Important: Core Web Vitals is ranking factor since 2021. Failing = competitors outrank you. Test homepage + 3 blog posts. Mobile score is 90% of your grade. Recheck monthly after adding new widgets or ads.

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