Why should I test speed before launch rather than after?

Fixing performance issues before launch is significantly easier and cheaper than after go-live. Post-launch fixes risk disrupting live users, require deployment cycles, and may cause temporary ranking fluctuations. Pre-launch, you can make radical changes in a staging environment with no user impact.

What performance score should I aim for at launch?

Aim for 90+ on desktop and 80+ on mobile. A score of 80+ on mobile means your Core Web Vitals are likely passing, which is the most important threshold for Google's Page Experience ranking signal.

Can I test a password-protected staging site?

Password protection (HTTP auth) will prevent the speed test tool from loading the staging site. Temporarily disable HTTP auth (or whitelist the test tool's IP) when running pre-launch speed tests.

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Test Website Speed Before Launch

Launching a slow website costs you first impressions, search rankings, and conversion rate from day one. FixTools helps you identify and fix performance issues before your site goes live — when they are easiest and cheapest to fix.

⚡ Use Tool Now How it works

Cost: Free forever
Sign-up: Not required
Processing: In your browser
Privacy: Files stay local

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Pre-launch performance audit

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Core Web Vitals pass/fail check

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Actionable recommendations before go-live

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Website Speed Test

All processing happens in your browser — your files are never uploaded to any server.

🚀Open Website Speed Test

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How to use this tool

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Enter your staging URL to run a complete pre-launch speed test. Fix any failing metrics before switching to your live domain.

How It Works

Step-by-step guide to test website speed before launch:

1
Test on staging before launch
Run the speed test on your staging URL (not your live site). Fix all performance issues before switching DNS.
2
Test all key page templates
Test homepage, a product or service page, a blog post, and any page with heavy media or embeds. Each template may have different performance characteristics.
3
Ensure all Core Web Vitals pass
Check LCP, CLS, and INP against the Good thresholds. Failing any CWV at launch means starting with a Page Experience penalty.
4
Target 80+ on mobile before go-live
Do not launch with a mobile score under 70. Address the top failing opportunities shown in the report until you reach at least 80 on mobile.

Real-world examples

Common situations where this approach makes a real difference:

Agency handover quality gate

A web agency includes a speed test report as part of their formal launch sign-off. The client must approve a mobile score of at least 80 before the live DNS switch is authorised, preventing under-optimised sites from launching.

WooCommerce redesign

A developer relaunching an e-commerce site on a new theme tests the staging site and discovers a mobile score of 42 due to the new theme loading 22 font variants. Limiting to 2 font weights boosts the score to 76 before launch.

Startup MVP launch

A startup founder preparing their first website uses the pre-launch speed test to identify that their hero video is causing a 7-second load time. They replace it with a static image and launch with a 2.1-second LCP instead.

When to use this guide

Use this as a mandatory step in your website launch checklist, before switching DNS to a new site or deploying a major redesign.

Pro tips

Get better results with these expert suggestions:

Test on staging before switching DNS

Run all performance tests on your staging URL before pointing your domain to the new site. This lets you fix issues in a safe environment without affecting live traffic or current search rankings.

Include all page templates, not just the homepage

Performance issues often appear on specific page types — product pages with image galleries, long-form content pages, or pages with embedded videos. Test one representative page of each template type.

Target a mobile performance score of 80+ before launching

A score under 70 on mobile at launch means you are starting with a Page Experience disadvantage that will take weeks to fix. Delay launch if needed to get mobile performance to at least 80.