Performance

GTmetrix

The performance auditing tool used on every client build — not to chase a vanity grade, but to catch what’s actually slowing a site down before launch.

Performance

2026-07-30 22:57:42

5 min

Service Screenshot Placeholder (dev only)

Quick Summary

Pricing

Free tier available (limited daily tests, single page); paid plans start around $15/month for monitoring and multi-location testing.

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Why We Recommend It

A letter grade is the least useful part of the report.

GTmetrix’s A-to-F grade is what gets screenshotted, but the actual value is underneath it: a waterfall chart showing exactly which request is slow, and Core Web Vitals data (Largest Contentful Paint, Total Blocking Time, Cumulative Layout Shift) that reflects real user experience, not just a synthetic score. That detail is what turns “the site feels slow” into a specific, fixable list — an oversized hero image, a render-blocking script, an unoptimised font load.

Key Features

Waterfall charts

Shows the exact loading order and timing of every request on a page, which is where the real bottlenecks usually show up.

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Core Web Vitals reporting

Measures the same metrics Google uses as a ranking signal, not just an arbitrary internal score.

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Multi-location testing

Tests from different server regions, relevant for a studio serving clients across the US, UK, Canada, and Australia.

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Perfect For

Pre-launch performance audits on every new build

Diagnosing a specific complaint like “the site feels slow” into an actual fixable cause

Ongoing monitoring on client sites where performance affects conversion

Probably Not For

Testing an entire multi-page site at once on the free tier — it’s single-page by default

Anyone wanting a single definitive score rather than a diagnostic breakdown

How We Use It

Baseline

Every build is tested before launch to catch obvious issues — unoptimised images, blocking scripts — while they’re still cheap to fix.

Diagnosis

The waterfall chart is used to trace a specific slow request back to its actual cause, rather than guessing.

Recheck

Re-tested after fixes to confirm the change actually moved the numbers, not just assumed it did.

Alternatives

Google PageSpeed Insights

Free, uses the same underlying Lighthouse engine, less detailed diagnostic breakdown.

Best for: A quick free check without needing an account

WebPageTest

More technical and configurable, aimed more at developers than a quick client-facing report.

Best for: Deeper performance investigation on complex sites

Related Resources

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Questions

Before you decide.

Is a GTmetrix grade the same as a Google ranking factor?

Not directly — the grade itself is GTmetrix’s own scoring, but the underlying Core Web Vitals data it reports is the same data Google actually uses as a ranking signal.

What GTmetrix grade should a business site aim for?

Grade A is a reasonable target, but the specific Core Web Vitals numbers underneath it matter more than the letter itself.

Can GTmetrix fix performance issues automatically?

No — it diagnoses and reports issues; fixing them (image optimisation, script loading, caching) is separate implementation work.

Need help putting this to work?

What to expect

Founder-led, start to finish.

Response within one business day.

No-obligation initial consultation.

A limited number of projects each quarter, across the US, UK, Canada, and Australia.