Website speed test and Core Web Vitals

Test your website’s speed with your chosen device, network, and region settings. Milten shows what slows it down and recommends fixes.

MobileDesktop

Advanced settings

How it works

How a website speed audit works

From one URL to a developer-ready task list: Milten shows not only a score, but also the specific causes of performance drops.

01 · URL

Enter the page URL

Check a homepage, landing page, catalog, or product card. Milten runs a browser audit and accounts for selected region, network, and device.

SSLhttps://your-site.com

02 · SCAN

Scan speed and frontend

Core Web Vitals, network, heavy scripts, layout shifts, and HTML semantics are combined into one mobile and desktop report.

Analysis42%

03 · PLAN

Get a fix plan

Review problematic resources and recommendations in the report. After making changes, repeat the check with the same settings and compare results.

✓Fix CLS in cards+14

✓Preload hero font+6

✓Split SVG sprite+3

What we measure

What the Core Web Vitals check shows

Milten splits the overall score into clear loading, interactivity, and layout stability metrics so the team sees the cause, not just a number.

First Contentful Paint

0.3s

Largest Contentful Paint

1.0s

Speed Index

0.9s

Cumulative Layout Shift

0.00

Interaction to Next Paint

100ms

Total Blocking Time

0ms

Tools

Tools for speed, code, and SEO audits

Run focused checks or combine them into one report: performance, accessibility, meta tags, JavaScript, CSS, and markup quality in one interface.

All tools

Speed scanner

LCP, INP, CLS, and website acceleration recommendations

SEO audit

Audit up to 5 pages for SEO, metadata and content availability before and after JavaScript.

INP debugger

Find long interactions and heavy handlers

AI agent website audit: content and access

Check page content, structure and public access settings for AI agents. Find technical obstacles without predicting citations or inclusion in AI answers.

BFCache test

Why the page is not restored from browser cache

JS scanner

Bundle, third-party script, and blocking analysis

Memory leaks

Memory growth, stuck listeners, and SPA degradation

HTTPS and security headers check

Check HTTPS, CSP, security headers and cookie attributes for one page. Get a passive configuration report with evidence and priorities for manual review.

CSS audit

Unused styles, unstable blocks, and CLS risks

HTML validator

HTML errors, semantics, and basic SEO signals

Accessibility

WCAG, contrast, focus, and interface accessibility

Design tokens

Token, color, typography, and UI pattern checks

Comparison

Why Milten is more useful than a regular speed check

Classic services show a score. Milten adds prioritization, history, monitoring, and a working task list for the team.

Feature	Milten	GTmetrix	PageSpeed	Pingdom
AI recommendations	Yes	No	No	No
Detailed prioritized report	Yes	Partial	Partial	No
Scans from multiple regions	Yes	Partial	No	Partial
Run history	Yes	Partial	No	Partial
Wide toolset	Yes	No	No	No
Monitoring and alerts	Yes	Yes	No	Yes
API access	Yes	No	Partial	No
Real user monitoring	Yes	No	No	No
Free plan	Yes	Yes	Yes	Partial

24/7 monitoring

Website speed monitoring after releases

Add important pages to a project. Milten checks them on a schedule and saves results so you can spot regressions and assess your fixes.

Regular checks

Keep result history to see speed trends, release impact, and seasonal load changes.

Regression alerts

Set notification conditions to learn about changes in results. Connect Telegram to receive project notifications.

Release comparison

Compare measurements before and after an update. If performance gets worse, open the detailed report to investigate what changed.

Example check history

88example score

1.7 sLCP on repeat check

24hobservation window

0006121824

TGLCP: 3.2 s · configured threshold exceededExample · Telegram notification14:32

CLSCLS on /catalog rose to 0.18Example · metric change14:35

OKRepeat check: LCP 1.7 s, score 88Example · result after a fix15:18

FAQ

Frequently asked questions

What people usually ask about Core Web Vitals and the service.

What are Core Web Vitals and how do they affect SEO?+

Core Web Vitals measure main content loading (LCP), responsiveness (INP), and visual stability (CLS). Google uses these metrics in its ranking systems, but good scores do not guarantee high rankings. A browser test helps diagnose a page under selected conditions; real users may have a different experience.

How do I check my website speed?+

Enter a URL, choose a device and region, and sign in to start. Free allows 5 manual runs per UTC day; paid Starter and Pro allow 100. The daily total is shared across tools. Automatic monitoring does not use manual runs.

What should I do if LCP is too high?+

Find the LCP element in the report, usually a hero image or heading, and work on it: preload fonts/images, reduce weight, use CDN, and remove render-blocking resources. Milten highlights the LCP element directly on the page screenshot.

How long does a website analysis take?+

Duration depends on the page, tool, network profile, and number of runs. A slow network or repeated measurements take longer. Follow the audit status after starting.

How do I fix CLS issues?+

Three core rules: set width/height or aspect-ratio for all media, do not insert content above visible content, and use font-display: swap plus preload for fonts. The report shows each element that caused a shift and its contribution to total CLS.

Start with one page

Run a free Milten audit and get a report on Core Web Vitals, frontend issues, and first optimization steps.

Start analysis