Report Summary

  • 60

    Performance

    Renders faster than
    75% of other websites

  • 65

    Accessibility

    Visual factors better than
    that of 30% of websites

  • 67

    Best Practices

    More advanced features
    available than in
    24% of websites

  • 67

    SEO

    Google-friendlier than
    26% of websites

physicslab.org

Welcome to PhysicsLAB!

Page Load Speed

541 ms in total

First Response

149 ms

Resources Loaded

289 ms

Page Rendered

103 ms

physicslab.org screenshot

About Website

Click here to check amazing PhysicsLAB content for United States. Otherwise, check out these important facts you probably never knew about physicslab.org

PhysicsLAB, an online high school physics program, was started in 1997. Online content can be accessed through a comprehensive table of contents, search engine, and in curriculum groups.

Visit physicslab.org

Key Findings

We analyzed Physicslab.org page load time and found that the first response time was 149 ms and then it took 392 ms to load all DOM resources and completely render a web page. This is an excellent result, as only 5% of websites can load faster. This domain responded with an error, which can significantly jeopardize Physicslab.org rating and web reputation

Performance Metrics

physicslab.org performance score

60

Measured Metrics

name

value

score

weighting

FCP (First Contentful Paint)

Value2.2 s

77/100

10%

LCP (Largest Contentful Paint)

Value3.0 s

78/100

25%

SI (Speed Index)

Value2.8 s

96/100

10%

TBT (Total Blocking Time)

Value1,760 ms

10/100

30%

CLS (Cumulative Layout Shift)

Value0.026

100/100

15%

TTI (Time to Interactive)

Value6.7 s

56/100

10%

Network Requests Diagram

physicslab.org

149 ms

PhysicsLab.css

57 ms

Home.gif

60 ms

Directions.jpg

63 ms

SearchEngine.jpg

63 ms

Our browser made a total of 25 requests to load all elements on the main page. We found that 92% of them (23 requests) were addressed to the original Physicslab.org, 8% (2 requests) were made to Google-analytics.com. The less responsive or slowest element that took the longest time to load (150 ms) belongs to the original domain Physicslab.org.

Page Optimization Overview & Recommendations

Page size can be reduced by 22.6 kB (29%)

Content Size

77.6 kB

After Optimization

55.0 kB

In fact, the total size of Physicslab.org main page is 77.6 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 35.3 kB which makes up the majority of the site volume.

HTML Optimization

-70%

Potential reduce by 10.1 kB

  • Original 14.4 kB
  • After minification 11.9 kB
  • After compression 4.3 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 2.5 kB, which is 17% 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 10.1 kB or 70% of the original size.

Image Optimization

-9%

Potential reduce by 3.3 kB

  • Original 35.3 kB
  • After minification 32.0 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. PhysicsLAB images are well optimized though.

JavaScript Optimization

-0%

Potential reduce by 34 B

  • Original 17.2 kB
  • After minification 17.2 kB
  • After compression 17.1 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. This website has mostly compressed JavaScripts.

CSS Optimization

-86%

Potential reduce by 9.2 kB

  • Original 10.7 kB
  • After minification 6.1 kB
  • After compression 1.5 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. Physicslab.org needs all CSS files to be minified and compressed as it can save up to 9.2 kB or 86% of the original size.

Requests Breakdown

We found no issues to fix!

Requests Now

21

After Optimization

21

The browser has sent 21 CSS, Javascripts, AJAX and image requests in order to completely render the main page of PhysicsLAB. According to our analytics all requests are already optimized.

Accessibility Review

physicslab.org accessibility score

65

Accessibility Issues

ARIA

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.

Impact

Issue

High

[aria-*] attributes do not match their roles

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

<frame> or <iframe> elements do not have a title

High

Image elements do not have [alt] attributes

High

Links do not have a discernible name

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

Best Practices

physicslab.org 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

Serves images with low resolution

General

Impact

Issue

High

Browser errors were logged to the console

SEO Factors

physicslab.org SEO score

67

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

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 Physicslab.org 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 Physicslab.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 PhysicsLAB. 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: