Lighthouse Desktop

· 0 checks — Desktop Lighthouse audit -- Performance, Accessibility, Best Practices, and SEO category breakdown.

SCORE

GRADE

FIX

REVIEW

PASS

INFO

Detailed Report

Audit breakdown by category with detailed findings.

Performance

Insights

Remove large, duplicate JavaScript modules from bundles to reduce unnecessary bytes consumed by network activity.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Polyfills and transforms enable older browsers to use new JavaScript features. However, many aren't necessary for modern browsers. Consider modifying your JavaScript build process to not transpile Baseline features, unless you know you must support older browsers. Learn why most sites can deploy ES6+ code without transpiling

Why this matters

Performance issues directly impact user engagement and conversion rates.

3rd party code can significantly impact load performance. Reduce and defer loading of 3rd party code to prioritize your page's content.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Layout shifts occur when elements move absent any user interaction. Investigate the causes of layout shifts, such as elements being added, removed, or their fonts changing as the page loads.

Why this matters

Performance issues directly impact user engagement and conversion rates.

headings: [map[key:node label:Element subItemsHeading:map[key:extra] valueType:node] map[granularity:0.001 key:score label:Layout shift score subItemsHeading:map[key:cause valueType:text] valueType:numeric]]

items: [map[node:map[type:text value:Total] score:0.461442] map[node:map[boundingRect:map[bottom:940 height:940 left:0 right:1350 top:0 width:1350] lhId:page-1-DIV nodeLabel:Zaopiekujemy się Twoją Wspólnotą Na Nas mozesz polegać Zgłoś nieruchomość Spr… path:1,HTML,1,BODY,1,SECTION,0,DIV,0,DIV,2,DIV,0,DIV selector:div.owl-stage-outer > div.owl-stage > div.owl-item > div.main-photo snippet:<div class="main-photo" style="background-image: url("https://koloseum.com.pl/assets/images/app/banners/1…");"> type:node] score:0.461331 subItems:map[items:[map[cause:Unsized image element extra:map[boundingRect:map[bottom:1925 height:369 left:105 right:659 top:1556 width:554] lhId:page-14-IMG nodeLabel:div.col-xl-6 > div.row > div.offer-img-container > img.img-fluid path:1,HTML,1,BODY,3,SECTION,0,DIV,1,DIV,0,DIV,0,DIV,0,DIV,0,IMG selector:div.col-xl-6 > div.row > div.offer-img-container > img.img-fluid snippet:<img src="https://koloseum.com.pl/assets/images/app/banners/6.jpg" alt="" class="img-fluid"> type:node]] map[cause:Web font extra:map[type:url value:https://fonts.gstatic.com/s/lato/v25/S6uyw4BMUTPHjx4wXiWtFCc.woff2]] map[cause:Web font extra:map[type:url value:https://fonts.gstatic.com/s/lato/v25/S6u9w4BMUTPHh50XSwiPGQ3q5d0.woff2]] map[cause:Web font extra:map[type:url value:https://fonts.gstatic.com/s/lato/v25/S6u9w4BMUTPHh6UVSwiPGQ3q5d0.woff2]] map[cause:Web font extra:map[type:url value:https://fonts.gstatic.com/s/lato/v25/S6u9w4BMUTPHh7USSwaPGQ3q5d0N7w.woff2]]] type:subitems]] map[node:map[boundingRect:map[bottom:68 height:60 left:489 right:1214 top:8 width:726] lhId:page-2-UL nodeLabel:START O NAS OFERTA ZGŁOŚ NIERUCHOMOŚĆ KONTAKT ZGŁOSZENIE E-KARTOTEKA path:1,HTML,1,BODY,0,DIV,0,DIV,0,NAV,2,DIV,0,UL selector:div.container > nav.navbar > div#navbarSupportedContent > ul.nav snippet:<ul class="nav navbar-nav ml-auto navbar-right main-menu"> type:node] score:0.000111 subItems:map[items:[map[cause:Unsized image element extra:map[boundingRect:map[bottom:1925 height:369 left:105 right:659 top:1556 width:554] lhId:page-14-IMG nodeLabel:div.col-xl-6 > div.row > div.offer-img-container > img.img-fluid path:1,HTML,1,BODY,3,SECTION,0,DIV,1,DIV,0,DIV,0,DIV,0,DIV,0,IMG selector:div.col-xl-6 > div.row > div.offer-img-container > img.img-fluid snippet:<img src="https://koloseum.com.pl/assets/images/app/banners/6.jpg" alt="" class="img-fluid"> type:node]]] type:subitems]]]

Consider setting font-display to swap or optional to ensure text is consistently visible. swap can be further optimized to mitigate layout shifts with font metric overrides.

Why this matters

Performance issues directly impact user engagement and conversion rates.

URL	Est Savings
/assets/fonts/font-awesome/fonts/fontawesome-webfont.woff...	365 ms
fonts.gstatic.com/s/lato/v25/S6uyw4BMUTPHjxAwXiWtFCfQ7A.woff2	30 ms
fonts.gstatic.com/s/lato/v25/S6u9w4BMUTPHh50XSwaPGQ3q5d0N7w.woff2	30 ms
fonts.gstatic.com/s/lato/v25/S6u9w4BMUTPHh7USSwiPGQ3q5d0.woff2	25 ms
fonts.gstatic.com/s/lato/v25/S6u9w4BMUTPHh6UVSwiPGQ3q5d0.woff2	20 ms
fonts.gstatic.com/s/lato/v25/S6u9w4BMUTPHh6UVSwaPGQ3q5d0N7w.woff2	20 ms
fonts.gstatic.com/s/lato/v25/S6u9w4BMUTPHh7USSwaPGQ3q5d0N7w.woff2	20 ms
fonts.gstatic.com/s/lato/v25/S6u9w4BMUTPHh50XSwiPGQ3q5d0.woff2	15 ms
fonts.gstatic.com/s/lato/v25/S6uyw4BMUTPHjx4wXiWtFCc.woff2	10 ms

A forced reflow occurs when JavaScript queries geometric properties (such as offsetWidth) after styles have been invalidated by a change to the DOM state. This can result in poor performance. Learn more about forced reflows and possible mitigations.

Why this matters

Performance issues directly impact user engagement and conversion rates.

headings: [map[key:source label:Source valueType:source-location] map[granularity:1 key:reflowTime label:Total reflow time valueType:ms]]

items: [map[reflowTime:114.467 source:map[type:text value:[unattributed]]]]

Avoid chaining critical requests by reducing the length of chains, reducing the download size of resources, or deferring the download of unnecessary resources to improve page load.

Why this matters

Performance issues directly impact user engagement and conversion rates.

description: [preconnect](https://developer.chrome.com/docs/lighthouse/performance/uses-rel-preconnect/) hints help the browser establish a connection earlier in the page load, saving time when the first request for that origin is made. The following are the origins that the page preconnected to.

title: Preconnected origins

value: no origins were preconnected

description: Add [preconnect](https://developer.chrome.com/docs/lighthouse/performance/uses-rel-preconnect/) hints to your most important origins, but try to use no more than 4.

title: Preconnect candidates

Requests are blocking the page's initial render, which may delay LCP. Deferring or inlining can move these network requests out of the critical path.

Why this matters

Performance issues directly impact user engagement and conversion rates.

URL	Transfer Size	Duration
koloseum.com.pl/assets/js/wow/animate.css	4.2 KiB
koloseum.com.pl/assets/fonts/font-awesome/css/font-awesome.min.css	6.4 KiB
koloseum.com.pl/assets/js/fancybox/jquery.fancybox.min.css	3.2 KiB
koloseum.com.pl/assets/js/owl-carousel/assets/owl.carousel.min.css	1.1 KiB
koloseum.com.pl/assets/css/site.min.css?v=2	2.1 KiB
koloseum.com.pl/assets/css/animation.css	208 B
koloseum.com.pl/assets/css/bootstrap.min.css	18.2 KiB	406 ms
koloseum.com.pl/assets/css/typography.css	536 B
koloseum.com.pl/assets/css/structure.css	1.0 KiB
fonts.googleapis.com/css?family=Lato:300,400,700,900&subset=latin-ext	1.0 KiB	227 ms

A long cache lifetime can speed up repeat visits to your page. Learn more about caching.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Request	Cache TTL	Transfer Size
koloseum.com.pl/assets/images/app/banners/1.jpg	604800.0 s	497.2 KiB
koloseum.com.pl/assets/images/app/banners/9.jpg	604800.0 s	488.7 KiB
koloseum.com.pl/assets/images/app/banners/6.jpg	604800.0 s	86.8 KiB
koloseum.com.pl/assets/images/app/banners/5.jpg	604800.0 s	86.7 KiB
koloseum.com.pl/assets/images/app/banners/7.jpg	604800.0 s	86.7 KiB
/assets/fonts/font-awesome/fonts/fontawesome-webfont.woff...	604800.0 s	75.5 KiB
koloseum.com.pl/assets/js/jquery-3.3.1.min.js	604800.0 s	29.5 KiB
/maps/api/js?key=AIzaSyCmL18misQw9KdwqGaw3zHkitj8vG6QF2Y&...	1800.0 s	2.9 KiB
koloseum.com.pl/assets/js/fancybox/jquery.fancybox.min.js	604800.0 s	19.0 KiB
koloseum.com.pl/assets/css/bootstrap.min.css	604800.0 s	18.2 KiB
koloseum.com.pl/assets/js/bootstrap.min.js	604800.0 s	12.6 KiB
koloseum.com.pl/assets/js/owl-carousel/owl.carousel.min.js	604800.0 s	11.1 KiB
koloseum.com.pl/assets/images/app/logo.svg	604800.0 s	7.9 KiB
koloseum.com.pl/assets/js/tether.min.js	604800.0 s	7.4 KiB
koloseum.com.pl/assets/fonts/font-awesome/css/font-awesome.min.css	604800.0 s	6.4 KiB
koloseum.com.pl/assets/js/wow/animate.css	604800.0 s	4.2 KiB
koloseum.com.pl/assets/js/fancybox/jquery.fancybox.min.css	604800.0 s	3.2 KiB
koloseum.com.pl/assets/js/wow/wow.min.js	604800.0 s	2.7 KiB
koloseum.com.pl/assets/css/site.min.css?v=2	604800.0 s	2.1 KiB
koloseum.com.pl/assets/js/site.js	604800.0 s	1.4 KiB
koloseum.com.pl/assets/js/owl-carousel/assets/owl.carousel.min.css	604800.0 s	1.1 KiB
koloseum.com.pl/assets/css/structure.css	604800.0 s	1.0 KiB
koloseum.com.pl/assets/css/typography.css	604800.0 s	536 B
koloseum.com.pl/assets/css/animation.css	604800.0 s	208 B

Reducing the download time of images can improve the perceived load time of the page and LCP. Learn more about optimizing image size

Why this matters

Performance issues directly impact user engagement and conversion rates.

	URL	Resource Size	Est Savings
Zaopiekujemy się Twoją Wspólnotą Na Nas mozesz polegać Zgłoś nieruchomość Spr… `div.owl-stage-outer > div.owl-stage > div.owl-item > div.main-photo`	koloseum.com.pl/assets/images/app/banners/1.jpg	496.8 KiB	215.6 KiB
Poprowadzimy Twoją Nieruchomość Komercyjną Na Nas mozesz polegać Zgłoś nieruc… `div.owl-stage-outer > div.owl-stage > div.owl-item > div.main-photo`	koloseum.com.pl/assets/images/app/banners/9.jpg	488.4 KiB	207.1 KiB
Łatwy i szybki dostep przez E-KARTOTEKĘ dostosowaną do Twoich potrzeb `div.container > div.row > div.col-md-6 > img.img-fluid`	koloseum.com.pl/assets/images/app/banners/5.jpg	86.6 KiB	55.0 KiB
div.col-xl-6 > div.row > div.offer-img-container > img.img-fluid `div.col-xl-6 > div.row > div.offer-img-container > img.img-fluid`	koloseum.com.pl/assets/images/app/banners/6.jpg	86.6 KiB	53.3 KiB
div.col-xl-6 > div.row > div.offer-img-container > img.img-fluid `div.col-xl-6 > div.row > div.offer-img-container > img.img-fluid`	koloseum.com.pl/assets/images/app/banners/7.jpg	86.6 KiB	53.3 KiB

These insights are also available in the Chrome DevTools Performance Panel - record a trace to view more detailed information.

Diagnostics

Reduce unused rules from stylesheets and defer CSS not used for above-the-fold content to decrease bytes consumed by network activity. Learn how to reduce unused CSS.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Estimated savings: 0.0 ms 17.0 KiB

URL	Transfer Size	Est Savings
koloseum.com.pl/assets/css/bootstrap.min.css	18.1 KiB	17.0 KiB

Set an explicit width and height on image elements to reduce layout shifts and improve CLS. Learn how to set image dimensions

Why this matters

Performance issues directly impact user engagement and conversion rates.

	URL
div.col-xl-6 > div.row > div.offer-img-container > img.img-fluid `div.col-xl-6 > div.row > div.offer-img-container > img.img-fluid`	koloseum.com.pl/assets/images/app/banners/6.jpg
div.col-xl-6 > div.row > div.offer-img-container > img.img-fluid `div.col-xl-6 > div.row > div.offer-img-container > img.img-fluid`	koloseum.com.pl/assets/images/app/banners/7.jpg
Łatwy i szybki dostep przez E-KARTOTEKĘ dostosowaną do Twoich potrzeb `div.container > div.row > div.col-md-6 > img.img-fluid`	koloseum.com.pl/assets/images/app/banners/5.jpg
Koloseum `div.container > nav.navbar > a.navbar-brand > img.main-logo`	koloseum.com.pl/assets/images/app/logo.svg

More information about the performance of your application. These numbers don't directly affect the Performance score.

These are the largest layout shifts observed on the page. Each table item represents a single layout shift, and shows the element that shifted the most. Below each item are possible root causes that led to the layout shift. Some of these layout shifts may not be included in the CLS metric value due to windowing. Learn how to improve CLS

Why this matters

Performance issues directly impact user engagement and conversion rates.

Element	Layout shift score
Zaopiekujemy się Twoją Wspólnotą Na Nas mozesz polegać Zgłoś nieruchomość Spr… `div.owl-stage-outer > div.owl-stage > div.owl-item > div.main-photo`	0.461
START O NAS OFERTA ZGŁOŚ NIERUCHOMOŚĆ KONTAKT ZGŁOSZENIE E-KARTOTEKA `div.container > nav.navbar > div#navbarSupportedContent > ul.nav`	0.000

●Time to Interactive 1.9 s

●Document request latency

●Optimize DOM size

●LCP breakdown

●Modern HTTP

●Optimize viewport for mobile

●Max Potential First Input Delay 20 ms

●Minify CSS

●Minify JavaScript

●Reduce unused JavaScript

●Avoids enormous network payloads Total size was 1,960 KiB

●JavaScript execution time 0.1 s

●Minimizes main-thread work 0.5 s

●Avoid non-composited animations 15 animated elements found

●Page didn't prevent back/forward cache restoration

●Network Requests

●Network Round Trip Times 160 ms

●Server Backend Latencies 180 ms

●Tasks

●Diagnostics

●Metrics

●Screenshot Thumbnails

●Final Screenshot

●Script Treemap Data

●Resources Summary

●Avoid multiple page redirects

●Initial server response time was short Root document took 190 ms

○INP breakdown

○LCP request discovery

○User Timing marks and measures

○Avoid long main-thread tasks

Accessibility

These checks highlight opportunities to improve the accessibility of your web app. Automatic detection can only detect a subset of issues and does not guarantee the accessibility of your web app, so manual testing is also encouraged.

Names and labels

When a button doesn't have an accessible name, screen readers announce it as "button", making it unusable for users who rely on screen readers. Learn how to make buttons more accessible.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Failing Elements
body > section#main-slider > div.owl-dots > button.owl-dot `body > section#main-slider > div.owl-dots > button.owl-dot`
body > section#main-slider > div.owl-dots > button.owl-dot `body > section#main-slider > div.owl-dots > button.owl-dot`

Screen reader users rely on frame titles to describe the contents of frames. Learn more about frame titles.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Failing Elements
body > section#map > iframe `body > section#map > iframe`

These are opportunities to improve the semantics of the controls in your application. This may enhance the experience for users of assistive technology, like a screen reader.

Contrast

Low-contrast text is difficult or impossible for many users to read. Learn how to provide sufficient color contrast.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Failing Elements
Zgłoś nieruchomość `div.owl-item > div.main-photo > div.banner-content > a.btn`
koloseum@koloseum.com.pl `div.row > div.col-md-4 > p > a`
+48 575 151 055 `div.row > div.col-md-4 > p > a`
+48 721 260 160 `div.row > div.col-md-4 > p > a`
+48 533 400 240 `div.row > div.col-md-4 > p > a`
+48 666 41 41 46 `div.row > div.col-md-4 > p > a`
ksiegowosc@koloseum.com.pl `div.row > div.col-md-4 > p > a`
WYŚLIJ WIADOMOŚĆ `div.col-md-8 > form > button.btn > span`
Koloseum.com.pl `div.row > div.col-6 > small > a`
Dioma.pl `div.row > div.col-6 > small > a`
Akceptuję `div#footer2 > div.col-12 > small > a#cookiesPolicyAccepted`
Więcej `div#footer2 > div.col-12 > small > a#cookies-accept`

These are opportunities to improve the legibility of your content.

Navigation

Properly ordered headings that do not skip levels convey the semantic structure of the page, making it easier to navigate and understand when using assistive technologies. Learn more about heading order.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Failing Elements
Administrowanie Wspólnotami Mieszkaniowymi `div.row > div.entry-content-right > div.entry-body > h4`
Adres: `div.container > div.row > div.col-md-4 > h5`

These are opportunities to improve keyboard navigation in your application.

Best practices

Disabling zooming is problematic for users with low vision who rely on screen magnification to properly see the contents of a web page. Learn more about the viewport meta tag.

Why this matters

Informational: a Permissions-Policy directive showing feature -> allowed origins.

Source: MDN Permissions-Policy

Failing Elements
head > meta `head > meta`

One main landmark helps screen reader users navigate a web page. Learn more about landmarks.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Failing Elements
html.no-js `html.no-js`

These items highlight common accessibility best practices.

○Interactive controls are keyboard focusable

○Interactive elements indicate their purpose and state

○The page has a logical tab order

○Visual order on the page follows DOM order

○User focus is not accidentally trapped in a region

○The user's focus is directed to new content added to the page

○HTML5 landmark elements are used to improve navigation

○Offscreen content is hidden from assistive technology

○Custom controls have associated labels

○Custom controls have ARIA roles

●`[aria-*]` attributes match their roles

●`[aria-hidden="true"]` is not present on the document `<body>`

●`[role]`s have all required `[aria-*]` attributes

●`[role]` values are valid

●`[aria-*]` attributes have valid values

●`[aria-*]` attributes are valid and not misspelled

●Image elements have `[alt]` attributes

●Form elements have associated labels

●ARIA attributes are used as specified for the element's role

●`[aria-hidden="true"]` elements do not contain focusable descendents

●Elements use only permitted ARIA attributes

●Document has a `<title>` element

●`<html>` element has a `[lang]` attribute

●`<html>` element has a valid value for its `[lang]` attribute

●Links have a discernible name

●Lists contain only `<li>` elements and script supporting elements (`<script>` and `<template>`).

●List items (`<li>`) are contained within `<ul>`, `<ol>` or `<menu>` parent elements

●Touch targets have sufficient size and spacing.

●Deprecated ARIA roles were not used

●Uses ARIA roles only on compatible elements

○`[accesskey]` values are unique

○`button`, `link`, and `menuitem` elements have accessible names

○Elements with `role="dialog"` or `role="alertdialog"` have accessible names.

○ARIA input fields have accessible names

○ARIA `meter` elements have accessible names

○ARIA `progressbar` elements have accessible names

○Elements with an ARIA `[role]` that require children to contain a specific `[role]` have all required children.

○`[role]`s are contained by their required parent element

○Elements with the `role=text` attribute do not have focusable descendents.

○ARIA toggle fields have accessible names

○ARIA `tooltip` elements have accessible names

○ARIA `treeitem` elements have accessible names

○The page contains a heading, skip link, or landmark region

○`<dl>`'s contain only properly-ordered `<dt>` and `<dd>` groups, `<script>`, `<template>` or `<div>` elements.

○Definition list items are wrapped in `<dl>` elements

○ARIA IDs are unique

○No form fields have multiple labels

○`<html>` element has an `[xml:lang]` attribute with the same base language as the `[lang]` attribute.

○Input buttons have discernible text.

○`<input type="image">` elements have `[alt]` text

○Links are distinguishable without relying on color.

○The document does not use `<meta http-equiv="refresh">`

○`<object>` elements have alternate text

○Select elements have associated label elements.

○Skip links are focusable.

○No element has a `[tabindex]` value greater than 0

○Cells in a `<table>` element that use the `[headers]` attribute refer to table cells within the same table.

○`<th>` elements and elements with `[role="columnheader"/"rowheader"]` have data cells they describe.

○`[lang]` attributes have a valid value

○`<video>` elements contain a `<track>` element with `[kind="captions"]`

○Tables have different content in the summary attribute and `<caption>`.

○All heading elements contain content.

○Image elements do not have `[alt]` attributes that are redundant text.

○Identical links have the same purpose.

○Elements with visible text labels have matching accessible names.

○Tables use `<caption>` instead of cells with the `[colspan]` attribute to indicate a caption.

○`<td>` elements in a large `<table>` have one or more table headers.

100

Best Practices

●Uses HTTPS

●Avoids deprecated APIs

●Avoids third-party cookies

●Allows users to paste into input fields

●Avoids requesting the geolocation permission on page load

●Avoids requesting the notification permission on page load

●Displays images with correct aspect ratio

●Serves images with appropriate resolution

●Page has the HTML doctype

●Properly defines charset

●No browser errors logged to the console

●No issues in the `Issues` panel in Chrome Devtools

●Ensure CSP is effective against XSS attacks

●Use a strong HSTS policy

●Ensure proper origin isolation with COOP

●Mitigate clickjacking with XFO or CSP

●Mitigate DOM-based XSS with Trusted Types

●Detected JavaScript libraries

●Page has valid source maps

○Redirects HTTP traffic to HTTPS

SEO

These checks ensure that your page is following basic search engine optimization advice. There are many additional factors Lighthouse does not score here that may affect your search ranking, including performance on Core Web Vitals. Learn more about Google Search Essentials.

Content Best Practices

Meta descriptions may be included in search results to concisely summarize page content. Learn more about the meta description.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Format your HTML in a way that enables crawlers to better understand your app’s content.

○Structured data is valid

●Page isn’t blocked from indexing

●Document has a `<title>` element

●Page has successful HTTP status code

●Links have descriptive text

●Links are crawlable

●robots.txt is valid

●Image elements have `[alt]` attributes

●Document has a valid `hreflang`

○Document has a valid `rel=canonical`