Tools & Wizards About Us

Report Summary

  • 96

    Performance

    Renders faster than
    94% of other websites

  • 57

    Accessibility

    Visual factors better than
    that of 24% of websites

  • 75

    Best Practices

    More advanced features
    available than in
    35% of websites

  • 67

    SEO

    Google-friendlier than
    26% of websites

teachersfirst.us

TeachersFirst: The web resource by teachers, for teachers

Page Load Speed

395 ms in total

First Response

40 ms

Resources Loaded

269 ms

Page Rendered

86 ms

About Website

Click here to check amazing Teachers First content. Otherwise, check out these important facts you probably never knew about teachersfirst.us

TeachersFirst is Thinking Teachers, Teaching Thinkers. TeachersFirst offers a rich collection of lessons, units, and educator-reviewed web resources designed to save teachers time by delivering just w...

Visit teachersfirst.us

Key Findings

We analyzed Teachersfirst.us page load time and found that the first response time was 40 ms and then it took 355 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.

Performance Metrics

teachersfirst.us performance score

96

Measured Metrics

name

value

score

weighting

FCP (First Contentful Paint)

Value2.1 s

80/100

10%

LCP (Largest Contentful Paint)

Value2.2 s

94/100

25%

SI (Speed Index)

Value2.5 s

97/100

10%

TBT (Total Blocking Time)

Value30 ms

100/100

30%

CLS (Cumulative Layout Shift)

Value0.011

100/100

15%

TTI (Time to Interactive)

Value3.2 s

95/100

10%

Network Requests Diagram

teachersfirst.us

40 ms

teachersfirst.us

84 ms

satelliteLib-105585cc7e1c04abf8c5af840e6023811b2f0cc2.js

37 ms

style.css

16 ms

tf3emin.css

27 ms

Our browser made a total of 24 requests to load all elements on the main page. We found that 79% of them (19 requests) were addressed to the original Teachersfirst.us, 8% (2 requests) were made to Stats.g.doubleclick.net and 4% (1 request) were made to Assets.adobedtm.com. The less responsive or slowest element that took the longest time to load (84 ms) belongs to the original domain Teachersfirst.us.

Page Optimization Overview & Recommendations

Page size can be reduced by 164.8 kB (60%)

Content Size

277.0 kB

After Optimization

112.2 kB

  • HTML
  • Images
  • JavaScript
  • CSS

In fact, the total size of Teachersfirst.us main page is 277.0 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. 20% of websites need less resources to load. Images take 117.1 kB which makes up the majority of the site volume.

HTML Optimization

-77%

Potential reduce by 29.6 kB

  • Original 38.6 kB
  • After minification 34.0 kB
  • After compression 9.0 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 4.6 kB, which is 12% 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 29.6 kB or 77% of the original size.

Image Optimization

-92%

Potential reduce by 108.2 kB

  • Original 117.1 kB
  • After minification 8.9 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, Teachers First needs image optimization as it can save up to 108.2 kB or 92% of the original volume. The most popular and efficient tools for JPEG and PNG image optimization are Jpegoptim and PNG Crush.

JavaScript Optimization

-23%

Potential reduce by 24.9 kB

  • Original 106.6 kB
  • After minification 106.5 kB
  • After compression 81.7 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 24.9 kB or 23% of the original size.

CSS Optimization

-14%

Potential reduce by 2.1 kB

  • Original 14.6 kB
  • After minification 14.6 kB
  • After compression 12.6 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. Teachersfirst.us needs all CSS files to be minified and compressed as it can save up to 2.1 kB or 14% of the original size.

Requests Breakdown

Number of requests can be reduced by 12 (55%)

Requests Now

22

After Optimization

10

  • AJAX
  • Images
  • JavaScript
  • CSS

The browser has sent 22 CSS, Javascripts, AJAX and image requests in order to completely render the main page of Teachers First. We recommend that multiple CSS and JavaScript files should be merged into one by each type, as it can help reduce assets requests from 9 to 1 for JavaScripts and from 5 to 1 for CSS and as a result speed up the page load time.

Network Requests Diagram

Accessibility Review

teachersfirst.us accessibility score

57

Accessibility Issues

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

Buttons do not have an accessible name

High

Image elements do not have [alt] attributes

High

Form elements do not have associated labels

High

Links do not have a discernible name

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

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

High

Heading elements are not in a sequentially-descending order

Best Practices

teachersfirst.us best practices score

75

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

High

Browser errors were logged to the console

SEO Factors

teachersfirst.us 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

Links do not have descriptive text

High

Image elements do not have [alt] attributes

Crawling and Indexing

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

Impact

Issue

High

Links are not crawlable

High

robots.txt is not valid

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 Teachersfirst.us 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 Teachersfirst.us 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 Teachers First. 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: