What are Core Web Vitals and what do the thresholds mean?

Core Web Vitals are three real-user metrics Google uses for page experience: Largest Contentful Paint (LCP, measures loading speed), Interaction to Next Paint (INP, measures responsiveness), and Cumulative Layout Shift (CLS, measures visual stability). A page passes at LCP 2.5 seconds or less, INP 200 milliseconds or less, and CLS 0.1 or less.

How is PerfDelta different from Google PageSpeed Insights?

PerfDelta uses the same data sources but tests several pages at once, benchmarks against the global average and competitors, and gives one shareable report, whereas Google PageSpeed Insights tests one URL at a time.

Can I test local or staging sites?

No. PerfDelta measures pages over the public internet, the way a real visitor or Google sees them. You must test the live, public URL instead of localhost or a login-protected site.

How does billing work and can I cancel anytime?

Paid plans are billed monthly or yearly through Paddle. You can switch between monthly and yearly at any time from the customer portal and cancel anytime; your plan stays active until the end of the paid period, then falls back to Free.

What happens when I reach my URL limit on a paid plan?

You can keep using your existing tracked URLs, but adding a new one is blocked until you remove one or upgrade to a plan with a higher limit.

Fact sheet · SEO tools

PerfDelta

Free website speed test measuring multiple pages with Core Web Vitals, lab metrics, competitor benchmarks and AI recommendations

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PerfDelta tests multiple pages of a website for both mobile and desktop, showing Core Web Vitals from real users, lab performance metrics, comparisons with

Overview

Screenshot of the PerfDelta homepage — What perfdelta.com looks like

PerfDelta is a free website speed test tool that measures multiple pages of any website simultaneously for mobile and desktop. It combines field data from real Chrome users (Core Web Vitals: Largest Contentful Paint, Interaction to Next Paint, Cumulative Layout Shift) with lab metrics from Google's Lighthouse to show both what users experience and why pages load slowly.

The tool benchmarks results against global averages and up to four competitor domains, includes AI-powered fix recommendations tailored to the detected technology stack, and detects the CMS, framework, server and CDN behind any site. Reports include full loading sequences, page weight breakdown by file type, third-party script analysis, and historical tracking over time.

Paid plans add automatic monitoring with daily or six-hourly measurements, performance budgets, email alerts, full report history, PDF export, CSV export for Agency and Scale plans, REST API access, white-label PDF generation, and access for AI agents via MCP. Every report gets a shareable link valid for 365 days, and no account or email is required for free testing.

Feature facts

Tests multiple pages automatically from sitemap
Competitor benchmark comparison with up to 4 competitors
Shows Core Web Vitals from real Chrome users
PageSpeed history tracking over time
Performance budgets with email alerts
Shareable reports with 365-day links
REST API and MCP access for AI agents

Pricing

Pricing model: Freemium

Free: test up to 3 pages with manual measurements only. Solo: €23/month or €230/year (25 monitored URLs, daily or weekly monitoring, 600 tests/month). Agency: €59/month or €590/year (150 monitored URLs, monitoring every 6 hours, 4,000 tests/month). Scale: €119/month or €1,190/year (500 monitored URL

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PerfDelta specifications

Specifications of PerfDelta
Section	SEO tools
Origin	Berlin, Germany
Website	perfdelta.com
Votes²	0

PerfDelta metrics

Fact file for perfdelta.com: Ahrefs Domain Rating and Majestic link facts, each with the change since the last fact check.
Metric	Value
Domain Rating	3 no change since last check
Trust Flow	0 no change since last check
Citation Flow	15 no change since last check
Referring domains	2 no change since last check
External backlinks	3 no change since last check

Fact: Ahrefs Domain Rating checked 12 Nov 2026, fact changed 2 Nov 2026. Fact: Majestic checked 2 Nov 2026, fact changed 2 Nov 2026. Link facts from Majestic. Trust Flow, Citation Flow and Topical Trust Flow are trademarks of Majestic-12 Ltd.

PerfDelta domain fact sheet

Open the fact sheet

Read from the public RDAP record on 11 Nov 2026, 12:34 UTC.
Domain age	2 years
Registered	26 Sep 2024
Expires	26 Sep 2027
Registrar	RegistryGate GmbH
DNSSEC	Not signed

Every domain fact for perfdelta.com

PerfDelta launch receipt sheet

What we have measured for PerfDelta since it went live on SaaS Directory Info on 2 November 2026.

3 Domain Rating (Ahrefs) no change since launch
at launch: 3 (2 Nov 2026); latest: 11 Nov 2026
0 Trust Flow (Majestic)
first measured 2 Nov 2026
2 Referring domains (Majestic)
first measured 2 Nov 2026

Day 10 since launch. Next receipt: day 30, 2 Dec 2026. The figures report a change; they do not say what caused it, and many things can. No figure here is a guess.

Biggest gains on SaaS Directory Info

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Step-by-step tips for before, during and after your launch, free to read on SaaS Directory Info.

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Frequently looked up

Q1What are Core Web Vitals and what do the thresholds mean?: Core Web Vitals are three real-user metrics Google uses for page experience: Largest Contentful Paint (LCP, measures loading speed), Interaction to Next Paint (INP, measures responsiveness), and Cumulative Layout Shift (CLS, measures visual stability). A page passes at LCP 2.5 seconds or less, INP 200 milliseconds or less, and CLS 0.1 or less.
Q2How is PerfDelta different from Google PageSpeed Insights?: PerfDelta uses the same data sources but tests several pages at once, benchmarks against the global average and competitors, and gives one shareable report, whereas Google PageSpeed Insights tests one URL at a time.
Q3Can I test local or staging sites?: No. PerfDelta measures pages over the public internet, the way a real visitor or Google sees them. You must test the live, public URL instead of localhost or a login-protected site.
Q4How does billing work and can I cancel anytime?: Paid plans are billed monthly or yearly through Paddle. You can switch between monthly and yearly at any time from the customer portal and cancel anytime; your plan stays active until the end of the paid period, then falls back to Free.
Q5What happens when I reach my URL limit on a paid plan?: You can keep using your existing tracked URLs, but adding a new one is blocked until you remove one or upgrade to a plan with a higher limit.

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