Google PageSpeed Insights vs FixRoast Speed Test: What is the Difference?

Google PageSpeed Insights is the default tool most developers reach for when checking website performance. It is free, it is from Google, and it provides Core Web Vitals data directly from the Chrome User Experience Report.

So why would you use anything else?

The short answer: PageSpeed Insights gives you data. FixRoast gives you answers. Both tools run the same Lighthouse audit under the hood, but what you see and what you can do with the results are very different.

The Same Engine, Different Experience

Both Google PageSpeed Insights and the FixRoast Page Speed Test use the Google Lighthouse API. This means the raw performance data, the metrics, the audit results, and the scoring methodology are identical. When FixRoast says your LCP is 3.2 seconds, that is the same 3.2 seconds PageSpeed Insights would report.

The difference is everything that happens after the data is collected.

What Google PageSpeed Insights Shows You

PageSpeed Insights presents results in a technical, audit-focused format designed for developers who already understand web performance.

What you get:

• A single performance score (0-100)
• Core Web Vitals metrics (LCP, CLS, INP, TTFB)
• A list of "Opportunities" with estimated savings
• A list of "Diagnostics" with technical details
• One category at a time (you must switch tabs for Accessibility, Best Practices, and SEO)

What you do not get:

• Explanations of what each issue means in practical terms
• Step-by-step instructions for fixing issues
• Priority ranking beyond estimated time savings
• Context about your specific tech stack
• All four categories in a single view

For someone who builds websites daily, this is fine. For a founder, marketer, or designer who needs to understand what is wrong and how to fix it, the raw audit output can be overwhelming.

What FixRoast's Speed Test Shows You

FixRoast takes the same Lighthouse data and transforms it into something actionable.

All Four Categories at Once

Instead of switching between tabs, FixRoast shows Performance, Accessibility, Best Practices, and SEO scores in a single dashboard view. You see exactly where your page stands across every dimension without clicking around.

AI-Powered Plain English Explanations

Every issue comes with a clear explanation of what it means and why it matters. Instead of "Eliminate render-blocking resources," you get an explanation like: "Two CSS files in your page header are preventing the browser from showing any content until they finish loading. This adds approximately 1.2 seconds to your page load time."

Step-by-Step Fix Instructions

Each issue includes specific instructions for fixing it, with code examples tailored to common platforms. If FixRoast detects you are running Next.js, the recommendations reference Next.js patterns. If you are on WordPress, you get WordPress-specific advice.

Priority Ranking

Not all performance issues are equal. FixRoast ranks issues by their actual impact on your user experience and search rankings, so you know what to tackle first. Fixing the top three issues often delivers 80% of the improvement.

Tech Stack Detection

FixRoast automatically detects your technology stack (React, Next.js, WordPress, Shopify, etc.) and tailors recommendations accordingly. A "reduce JavaScript" recommendation for a WordPress site looks very different from one for a Next.js app.

Side-by-Side Comparison

When to Use Each Tool

Use Google PageSpeed Insights when:

• You need to quickly check a score and already know what to look for
• You want to see raw CrUX field data for a specific URL
• You are debugging a specific Lighthouse audit and want the original format
• You need to share results with someone who specifically asks for PageSpeed data

Use FixRoast when:

• You want to understand what is actually wrong with your page speed
• You need step-by-step instructions to fix performance issues
• You are not a performance expert and want plain English guidance
• You want all four audit categories in one view
• You want recommendations tailored to your specific tech stack

Use both when:

• You want FixRoast's actionable insights plus the original Lighthouse data for verification
• You are making a case to your team and need both the business context (FixRoast) and the raw data (PageSpeed Insights)

Beyond Speed Testing

Page speed is only one aspect of landing page performance. If you want a complete analysis of your landing page covering design, copy, user experience, and technical performance, check out the full FixRoast landing page roast. It analyzes everything, not just speed metrics.

For AI search optimization, our AI search analysis tool checks how your page performs in AI-powered search engines like ChatGPT, Perplexity, and Google AI Overviews.

Try Both and Compare

The best way to understand the difference is to try them yourself. Run your URL through Google PageSpeed Insights and then through the FixRoast Page Speed Test. Compare the experience and decide which helps you take action faster.

If you want to optimize your images before re-testing, try the free FixRoast Image Optimizer to compress and convert your images to modern formats like WebP and AVIF.