Access casa.jlab.org. Center for Advanced Studies of Accelerators

Report Summary

name

value

score

weighting

FCP (First Contentful Paint)

Value8.5 s

0/100

10%

LCP (Largest Contentful Paint)

Value13.9 s

0/100

25%

SI (Speed Index)

Value9.2 s

13/100

10%

TBT (Total Blocking Time)

Value170 ms

93/100

30%

CLS (Cumulative Layout Shift)

Value0.552

13/100

15%

TTI (Time to Interactive)

Value10.6 s

23/100

10%

casa.jlab.org

27 ms

casa.jlab.org

40 ms

Our browser made a total of 2 requests to load all elements on the main page. We found that all of those requests were addressed to Casa.jlab.org and no external sources were called. The less responsive or slowest element that took the longest time to load (40 ms) belongs to the original domain Casa.jlab.org.

Content Size

47.8 kB

After Optimization

30.9 kB

In fact, the total size of Casa.jlab.org main page is 47.8 kB. This result falls within a vast category (top 1 000 000) of heavyweight, probably not optimized, and thus slow loading web pages. Only a small number of websites need less resources to load. Images take 31.9 kB which makes up the majority of the site volume.

HTML Optimization

-95%

Potential reduce by 4.9 kB

Original 5.2 kB
After minification 431 B
After compression 281 B

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 4.8 kB, which is 92% 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 4.9 kB or 95% of the original size.

Image Optimization

-8%

Potential reduce by 2.6 kB

Original 31.9 kB
After minification 29.3 kB

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. Casa J Lab images are well optimized though.

JavaScript Optimization

-70%

Potential reduce by 655 B

Original 939 B
After minification 521 B
After compression 284 B

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 655 B or 70% of the original size.

CSS Optimization

-89%

Potential reduce by 8.7 kB

Original 9.7 kB
After minification 3.2 kB
After compression 1.1 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. Casa.jlab.org needs all CSS files to be minified and compressed as it can save up to 8.7 kB or 89% of the original size.

Requests Now

After Optimization

Besides the initial HTML request, no CSS, Javascripts, AJAX or image files were requested in the course of web page rendering.

Accessibility Issues

These are opportunities to improve the usage of ARIA in your application which may enhance the experience for users of assistive technology, like a screen reader.

High

[role] values are not valid

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.

High

Form elements do not have associated labels

Areas of Improvement

High

Does not use HTTPS

Low

Ensure CSP is effective against XSS attacks

High

Serves images with low resolution

Low

Detected JavaScript libraries

High

Page has valid source maps

Search Engine Optimization Advices

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/).

High

Document uses legible font sizes

High

Tap targets are not sized appropriately

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 Casa.jlab.org 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 Casa.jlab.org 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 description is not detected on the main page of Casa J Lab. Lack of Open Graph description can be counter-productive for their social media presence, as such a description allows converting a website homepage (or other pages) into good-looking, rich and well-structured posts, when it is being shared on Facebook and other social media. For example, adding the following code snippet into HTML <head> tag will help to represent this web page correctly in social networks: