Tools & Wizards About Us
robertotrotta.com screenshot

Report Summary

  • 49

    Performance

    Renders faster than
    67% of other websites

  • 80

    Accessibility

    Visual factors better than
    that of 49% of websites

  • 83

    Best Practices

    More advanced features
    available than in
    55% of websites

  • 92

    SEO

    Google-friendlier than
    74% of websites

robertotrotta.com

Prof Roberto Trotta Cosmology and Astrophysics, Science communication and Education About -

Page Load Speed

2.8 sec in total

First Response

169 ms

Resources Loaded

2.3 sec

Page Rendered

376 ms

robertotrotta.com screenshot

About Website

Click here to check amazing Roberto Trotta content. Otherwise, check out these important facts you probably never knew about robertotrotta.com

Statistical analysis, Art and science collaboration, Science communication, Astrophysics consultancy for movies and artists, Data Analysis, Deep Learning, Machine Learning, Expert Witness | London & T...

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Key Findings

We analyzed Robertotrotta.com page load time and found that the first response time was 169 ms and then it took 2.6 sec to load all DOM resources and completely render a web page. This is a poor result, as 50% of websites can load faster.

Performance Metrics

robertotrotta.com performance score

49

Measured Metrics

name

value

score

weighting

FCP (First Contentful Paint)

Value3.1 s

45/100

10%

LCP (Largest Contentful Paint)

Value3.1 s

75/100

25%

SI (Speed Index)

Value23.1 s

0/100

10%

TBT (Total Blocking Time)

Value250 ms

84/100

30%

CLS (Cumulative Layout Shift)

Value1

2/100

15%

TTI (Time to Interactive)

Value31.3 s

0/100

10%

Network Requests Diagram

robertotrotta.com

169 ms

robertotrotta.com

842 ms

css

28 ms

css

44 ms

style.css

131 ms

Our browser made a total of 38 requests to load all elements on the main page. We found that 92% of them (35 requests) were addressed to the original Robertotrotta.com, 5% (2 requests) were made to Fonts.googleapis.com and 3% (1 request) were made to Googletagmanager.com. The less responsive or slowest element that took the longest time to load (842 ms) belongs to the original domain Robertotrotta.com.

Page Optimization Overview & Recommendations

Page size can be reduced by 572.8 kB (5%)

Content Size

11.2 MB

After Optimization

10.6 MB

  • HTML
  • Images
  • JavaScript
  • CSS

In fact, the total size of Robertotrotta.com main page is 11.2 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. 30% of websites need less resources to load. Images take 10.9 MB which makes up the majority of the site volume.

HTML Optimization

-78%

Potential reduce by 76.3 kB

  • Original 97.4 kB
  • After minification 95.7 kB
  • After compression 21.1 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. HTML code on this page is well minified. It is highly recommended that content of this web page should be compressed using GZIP, as it can save up to 76.3 kB or 78% of the original size.

Image Optimization

-4%

Potential reduce by 454.2 kB

  • Original 10.9 MB
  • After minification 10.5 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. Roberto Trotta images are well optimized though.

JavaScript Optimization

-25%

Potential reduce by 23.8 kB

  • Original 94.3 kB
  • After minification 93.7 kB
  • After compression 70.5 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 23.8 kB or 25% of the original size.

CSS Optimization

-39%

Potential reduce by 18.6 kB

  • Original 47.7 kB
  • After minification 47.1 kB
  • After compression 29.1 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. Robertotrotta.com needs all CSS files to be minified and compressed as it can save up to 18.6 kB or 39% of the original size.

Requests Breakdown

Number of requests can be reduced by 22 (61%)

Requests Now

36

After Optimization

14

  • Images
  • JavaScript
  • CSS

The browser has sent 36 CSS, Javascripts, AJAX and image requests in order to completely render the main page of Roberto Trotta. We recommend that multiple CSS and JavaScript files should be merged into one by each type, as it can help reduce assets requests from 15 to 1 for JavaScripts and from 9 to 1 for CSS and as a result speed up the page load time.

Network Requests Diagram

robertotrotta.com

robertotrotta.com

169 ms

robertotrotta.com

robertotrotta.com

842 ms

css

css

28 ms

css

css

44 ms

style.css

style.css

131 ms

style.min.css

style.min.css

253 ms

styles.css

styles.css

505 ms

ctf-styles.min.css

ctf-styles.min.css

213 ms

superfish.css

superfish.css

200 ms

flexslider.css

flexslider.css

207 ms

tmm_style.css

tmm_style.css

203 ms

script.min.js

script.min.js

250 ms

jquery-1.12.4-wp.js

jquery-1.12.4-wp.js

316 ms

jquery-migrate-1.4.1-wp.js

jquery-migrate-1.4.1-wp.js

250 ms

js

js

68 ms

comment-reply.min.js

comment-reply.min.js

240 ms

index.js

index.js

552 ms

index.js

index.js

553 ms

superfish.js

superfish.js

348 ms

jquery.fitvids.js

jquery.fitvids.js

348 ms

jquery.actual.min.js

jquery.actual.min.js

382 ms

tinynav.min.js

tinynav.min.js

428 ms

jquery.scrollTo.min.js

jquery.scrollTo.min.js

428 ms

jquery.isotope.min.js

jquery.isotope.min.js

551 ms

jquery.flexslider-min.js

jquery.flexslider-min.js

552 ms

theme_trust.js

theme_trust.js

551 ms

hs-2009-25-l-large_web.jpg

hs-2009-25-l-large_web.jpg

274 ms

STARBORN_US_Cover_LR-2.png

STARBORN_US_Cover_LR-2.png

601 ms

191030_trotta_roberto_001.jpg

191030_trotta_roberto_001.jpg

785 ms

Trotta-12.jpg

Trotta-12.jpg

373 ms

DSC2293-scaled.jpg

DSC2293-scaled.jpg

416 ms

ICL_I-Hub_0270.jpg

ICL_I-Hub_0270.jpg

614 ms

2014-02-10-15.07.33.jpg

2014-02-10-15.07.33.jpg

502 ms

direction_down.png

direction_down.png

462 ms

Roberto_Trotta_Round.001-300x300.jpeg

Roberto_Trotta_Round.001-300x300.jpeg

500 ms

SB_two_covers_updated.001-1024x576.jpeg

SB_two_covers_updated.001-1024x576.jpeg

544 ms

direction_prev.png

direction_prev.png

429 ms

direction_next.png

direction_next.png

431 ms

Accessibility Review

robertotrotta.com accessibility score

80

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.

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

Form elements do not have associated labels

High

Links do not have a discernible name

Best practices

These items highlight common accessibility best practices.

Impact

Issue

High

[user-scalable="no"] is used in the <meta name="viewport"> element or the [maximum-scale] attribute is less than 5.

Best Practices

robertotrotta.com 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

robertotrotta.com SEO score

92

Search Engine Optimization Advices

Crawling and Indexing

To appear in search results, crawlers need access to your app.

Impact

Issue

High

Links are not crawlable

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

High

Tap targets are not sized appropriately

Language and Encoding

  • Language Detected

    EN

  • Language Claimed

    EN

  • Encoding

    UTF-8

Language claimed in HTML meta tag should match the language actually used on the web page. Otherwise Robertotrotta.com can be misinterpreted by Google and other search engines. Our service has detected that English is used on the page, and it matches the claimed language. Our system also found out that Robertotrotta.com 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

robertotrotta.com

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