Report Summary

  • 70

    Performance

    Renders faster than
    81% of other websites

  • 58

    Accessibility

    Visual factors better than
    that of 25% of websites

  • 83

    Best Practices

    More advanced features
    available than in
    56% of websites

  • 92

    SEO

    Google-friendlier than
    75% of websites

cluster.co

Cluster - Group sharing for friends & family. The antidote to social media.

Page Load Speed

2 sec in total

First Response

110 ms

Resources Loaded

921 ms

Page Rendered

999 ms

cluster.co screenshot

About Website

Visit cluster.co now to see the best up-to-date Cluster content for United States and also check out these interesting facts you probably never knew about cluster.co

Cluster gives you a private space to share photos and memories with the people you choose, away from social media. Make your own groups and share pics, videos, comments, and chat!

Visit cluster.co

Key Findings

We analyzed Cluster.co page load time and found that the first response time was 110 ms and then it took 1.9 sec to load all DOM resources and completely render a web page. This is quite a good result, as only 35% of websites can load faster.

Performance Metrics

cluster.co performance score

70

Measured Metrics

name

value

score

weighting

FCP (First Contentful Paint)

Value2.0 s

84/100

10%

LCP (Largest Contentful Paint)

Value5.6 s

17/100

25%

SI (Speed Index)

Value2.2 s

99/100

10%

TBT (Total Blocking Time)

Value150 ms

94/100

30%

CLS (Cumulative Layout Shift)

Value0.141

78/100

15%

TTI (Time to Interactive)

Value4.8 s

79/100

10%

Network Requests Diagram

cluster.co

110 ms

homepage.bundle-v6fc2677a.css

178 ms

css

158 ms

css

169 ms

logo-white-vd6b2dcac.png

188 ms

Our browser made a total of 38 requests to load all elements on the main page. We found that 3% of them (1 request) were addressed to the original Cluster.co, 61% (23 requests) were made to Cluster-static.s3.amazonaws.com and 26% (10 requests) were made to Fonts.gstatic.com. The less responsive or slowest element that took the longest time to load (422 ms) relates to the external source Cluster-static.s3.amazonaws.com.

Page Optimization Overview & Recommendations

Page size can be reduced by 304.5 kB (12%)

Content Size

2.5 MB

After Optimization

2.2 MB

In fact, the total size of Cluster.co main page is 2.5 MB. This result falls beyond the top 1M of websites and identifies a large and not optimized web page that may take ages to load. 70% of websites need less resources to load. Images take 2.2 MB which makes up the majority of the site volume.

HTML Optimization

-81%

Potential reduce by 17.2 kB

  • Original 21.4 kB
  • After minification 15.8 kB
  • After compression 4.1 kB

HTML content can be minified and compressed by a website’s server. The most efficient way is to compress content using GZIP which reduces data amount travelling through the network between server and browser. This page needs HTML code to be minified as it can gain 5.6 kB, which is 26% of the original size. It is highly recommended that content of this web page should be compressed using GZIP, as it can save up to 17.2 kB or 81% of the original size.

Image Optimization

-6%

Potential reduce by 137.2 kB

  • Original 2.2 MB
  • After minification 2.1 MB

Image size optimization can help to speed up a website loading time. The chart above shows the difference between the size before and after optimization. Cluster images are well optimized though.

JavaScript Optimization

-61%

Potential reduce by 117.4 kB

  • Original 193.6 kB
  • After minification 193.6 kB
  • After compression 76.2 kB

It’s better to minify JavaScript in order to improve website performance. The diagram shows the current total size of all JavaScript files against the prospective JavaScript size after its minification and compression. It is highly recommended that all JavaScript files should be compressed and minified as it can save up to 117.4 kB or 61% of the original size.

CSS Optimization

-82%

Potential reduce by 32.6 kB

  • Original 39.9 kB
  • After minification 32.9 kB
  • After compression 7.3 kB

CSS files minification is very important to reduce a web page rendering time. The faster CSS files can load, the earlier a page can be rendered. Cluster.co needs all CSS files to be minified and compressed as it can save up to 32.6 kB or 82% of the original size.

Requests Breakdown

We found no issues to fix!

Requests Now

27

After Optimization

27

The browser has sent 27 CSS, Javascripts, AJAX and image requests in order to completely render the main page of Cluster. According to our analytics all requests are already optimized.

Accessibility Review

cluster.co accessibility score

58

Accessibility Issues

Contrast

These are opportunities to improve the legibility of your content.

Impact

Issue

High

Background and foreground colors do not have a sufficient contrast ratio.

Navigation

These are opportunities to improve keyboard navigation in your application.

Impact

Issue

High

Heading elements are not in a sequentially-descending order

Internationalization and localization

These are opportunities to improve the interpretation of your content by users in different locales.

Impact

Issue

High

<html> element does not have a [lang] attribute

Names and labels

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.

Impact

Issue

High

Image elements do not have [alt] attributes

High

Links do not have a discernible name

Best Practices

cluster.co best practices score

83

Areas of Improvement

Trust and Safety

Impact

Issue

High

Does not use HTTPS

High

Includes front-end JavaScript libraries with known security vulnerabilities

Low

Ensure CSP is effective against XSS attacks

General

Impact

Issue

Low

Detected JavaScript libraries

SEO Factors

cluster.co SEO score

92

Search Engine Optimization Advices

Content Best Practices

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

Impact

Issue

High

Image elements do not have [alt] attributes

Mobile Friendly

Make sure your pages are mobile friendly so users don’t have to pinch or zoom in order to read the content pages. [Learn more](https://developers.google.com/search/mobile-sites/).

Impact

Issue

High

Document uses legible font sizes

Language and Encoding

  • Language Detected

    EN

  • Language Claimed

    N/A

  • Encoding

    UTF-8

Language claimed in HTML meta tag should match the language actually used on the web page. Otherwise Cluster.co can be misinterpreted by Google and other search engines. Our service has detected that English is used on the page, and neither this language nor any other was claimed in <html> or <meta> tags. Our system also found out that Cluster.co main page’s claimed encoding is utf-8. Use of this encoding format is the best practice as the main page visitors from all over the world won’t have any issues with symbol transcription.

Social Sharing Optimization

Open Graph data is detected on the main page of Cluster. This is the best way to make the web page social media friendly. Here is how it looks like on Facebook: