Can Blogger Reach 100/100 on Lighthouse?
- Started
- August 1, 2026
- Completed
- August 3, 2026
- Result
- 100/100
- Tools
- Blogger, AI, Lighthouse
Objective
Blogger has a long-standing reputation in SEO circles as outdated, bloated, and difficult to optimize — the kind of platform people are usually told to migrate off of, not push to its technical limits. I’ve used Blogger since 2010, long before AI-assisted development existed as a workflow. I wanted to find out: with AI actually helping rewrite the template at a structural level, how far could a custom Blogger theme realistically go on Lighthouse?
Starting Point
- Fill in: which Blogger theme did you start from — a default Blogger theme, a third-party theme, or a from-scratch custom template?
- Fill in: what was the baseline Lighthouse score before any optimization work began?
Hypothesis
My working assumption going in: Blogger’s reputation for poor performance comes mostly from unoptimized default themes, bloated widgets, and render-blocking third-party scripts left in place by non-technical users — not from Blogger’s underlying hosting or template engine being incapable of good performance. If the template itself is rebuilt cleanly, Blogger should be able to compete with modern static-site output on Lighthouse.
Process
- Fill in: what specific changes did you (with AI) make to the template? For example: stripped unused widget scripts, rewrote the XML/HTML template by hand, optimized image loading, removed render-blocking CSS/JS, added proper meta tags and semantic HTML, minified inline styles, etc.
- Fill in: roughly how many optimization passes did this take? Was it one focused session or several rounds of test-and-fix?
Results
Final Lighthouse score: 100/100
- Fill in: was this 100/100 across all four categories (Performance, Accessibility, Best Practices, SEO), or specifically one category? Be precise here — this is the credibility-defining detail of the whole experiment.
- Fill in / attach: screenshot(s) of the actual Lighthouse report.
- Fill in: was this tested on mobile, desktop, or both? Lighthouse mobile and desktop scores can differ significantly.
What Worked
- Rebuilding the template structure directly rather than layering fixes on top of a default theme
- Fill in additional specifics
What Went Wrong
- Fill in: was there anything that didn’t work on the first attempt? A regression, a broken widget after stripping something out, a score that dropped before it improved?
What I Learned
- Blogger’s reputation for poor performance is largely a default theme and widget problem, not a fundamental platform limitation
- AI-assisted template rewriting makes a genuinely deep technical optimization pass achievable even without traditional front-end development background
- Fill in additional lessons specific to what you actually did
Conclusion
Yes — a heavily optimized, AI-assisted custom Blogger theme can reach 100/100 on Lighthouse. This challenges the common assumption that Blogger is inherently a poor technical choice for SEO-serious projects, and suggests the real gap between Blogger and modern static-site generators (like the Astro stack documented elsewhere on this site) is more about default configuration than raw platform capability.