Report Summary

  • 96

    Performance

    Renders faster than
    94% of other websites

  • 67

    Accessibility

    Visual factors better than
    that of 32% of websites

  • 67

    Best Practices

    More advanced features
    available than in
    24% of websites

  • 50

    SEO

    Google-friendlier than
    18% of websites

tectonics.caltech.edu

Tectonics Observatory at Caltech

Page Load Speed

1 sec in total

First Response

210 ms

Resources Loaded

636 ms

Page Rendered

166 ms

tectonics.caltech.edu screenshot

About Website

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Key Findings

We analyzed Tectonics.caltech.edu page load time and found that the first response time was 210 ms and then it took 802 ms to load all DOM resources and completely render a web page. This is quite a good result, as only 15% of websites can load faster.

Performance Metrics

tectonics.caltech.edu performance score

96

Measured Metrics

name

value

score

weighting

FCP (First Contentful Paint)

Value0.8 s

100/100

10%

LCP (Largest Contentful Paint)

Value2.5 s

89/100

25%

SI (Speed Index)

Value1.6 s

100/100

10%

TBT (Total Blocking Time)

Value140 ms

95/100

30%

CLS (Cumulative Layout Shift)

Value0

100/100

15%

TTI (Time to Interactive)

Value1.0 s

100/100

10%

Network Requests Diagram

tectonics.caltech.edu

210 ms

to_site.css

145 ms

top.jpg

416 ms

anvil_175.jpg

220 ms

creeping_faults2013_web.jpg

280 ms

Our browser made a total of 11 requests to load all elements on the main page. We found that all of those requests were addressed to Tectonics.caltech.edu and no external sources were called. The less responsive or slowest element that took the longest time to load (416 ms) belongs to the original domain Tectonics.caltech.edu.

Page Optimization Overview & Recommendations

Page size can be reduced by 50.3 kB (13%)

Content Size

396.9 kB

After Optimization

346.6 kB

In fact, the total size of Tectonics.caltech.edu main page is 396.9 kB. This result falls beyond the top 1M of websites and identifies a large and not optimized web page that may take ages to load. 15% of websites need less resources to load. Images take 383.6 kB which makes up the majority of the site volume.

HTML Optimization

-68%

Potential reduce by 6.9 kB

  • Original 10.1 kB
  • After minification 8.8 kB
  • After compression 3.3 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 1.3 kB, which is 13% 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 6.9 kB or 68% of the original size.

Image Optimization

-11%

Potential reduce by 41.1 kB

  • Original 383.6 kB
  • After minification 342.5 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. Obviously, Tectonics Caltech needs image optimization as it can save up to 41.1 kB or 11% of the original volume. The most popular and efficient tools for JPEG and PNG image optimization are Jpegoptim and PNG Crush.

CSS Optimization

-74%

Potential reduce by 2.3 kB

  • Original 3.1 kB
  • After minification 2.4 kB
  • After compression 810 B

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. Tectonics.caltech.edu needs all CSS files to be minified and compressed as it can save up to 2.3 kB or 74% of the original size.

Requests Breakdown

We found no issues to fix!

Requests Now

10

After Optimization

10

The browser has sent 10 CSS, Javascripts, AJAX and image requests in order to completely render the main page of Tectonics Caltech. According to our analytics all requests are already optimized.

Accessibility Review

tectonics.caltech.edu accessibility score

67

Accessibility Issues

Navigation

These are opportunities to improve keyboard navigation in your application.

Impact

Issue

High

[id] attributes on active, focusable elements are not unique

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

Best Practices

tectonics.caltech.edu best practices score

67

Areas of Improvement

Trust and Safety

Impact

Issue

High

Does not use HTTPS

Low

Ensure CSP is effective against XSS attacks

User Experience

Impact

Issue

High

Displays images with incorrect aspect ratio

High

Serves images with low resolution

SEO Factors

tectonics.caltech.edu SEO score

50

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

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

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 Tectonics.caltech.edu 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 Tectonics.caltech.edu 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 Tectonics Caltech. 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: