Tools & Wizards About Us
databaselecture.com screenshot

Report Summary

  • 48

    Performance

    Renders faster than
    67% of other websites

  • 85

    Accessibility

    Visual factors better than
    that of 60% of websites

  • 83

    Best Practices

    More advanced features
    available than in
    56% of websites

  • 73

    SEO

    Google-friendlier than
    31% of websites

databaselecture.com

Intro to Database Systems by Prof. Trummer (Cornell, Fall 2020)

Page Load Speed

1.3 sec in total

First Response

148 ms

Resources Loaded

980 ms

Page Rendered

128 ms

databaselecture.com screenshot

About Website

Visit databaselecture.com now to see the best up-to-date Database Lecture content and also check out these interesting facts you probably never knew about databaselecture.com

Database management systems: we introduce the SQL query language, covering features like joins, grouping, aggregation, and nested queries.

Visit databaselecture.com

Key Findings

We analyzed Databaselecture.com page load time and found that the first response time was 148 ms and then it took 1.1 sec to load all DOM resources and completely render a web page. This is quite a good result, as only 20% of websites can load faster.

Performance Metrics

databaselecture.com performance score

48

Measured Metrics

name

value

score

weighting

FCP (First Contentful Paint)

Value2.6 s

63/100

10%

LCP (Largest Contentful Paint)

Value2.6 s

87/100

25%

SI (Speed Index)

Value5.7 s

50/100

10%

TBT (Total Blocking Time)

Value13,390 ms

0/100

30%

CLS (Cumulative Layout Shift)

Value0

100/100

15%

TTI (Time to Interactive)

Value18.4 s

3/100

10%

Network Requests Diagram

databaselecture.com

148 ms

style1.css

54 ms

i7iugcmrBJ8

120 ms

6xOADZBXU3c

152 ms

qHF_u5EZv3I

218 ms

Our browser made a total of 11 requests to load all elements on the main page. We found that 18% of them (2 requests) were addressed to the original Databaselecture.com, 82% (9 requests) were made to Youtube.com. The less responsive or slowest element that took the longest time to load (218 ms) relates to the external source Youtube.com.

Page Optimization Overview & Recommendations

Page size can be reduced by 5.3 kB (3%)

Content Size

200.3 kB

After Optimization

195.0 kB

  • HTML
  • JavaScript
  • CSS

In fact, the total size of Databaselecture.com main page is 200.3 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. 80% of websites need less resources to load and that’s why Accessify’s recommendations for optimization and resource minification can be helpful for this project. Javascripts take 136.6 kB which makes up the majority of the site volume.

HTML Optimization

-65%

Potential reduce by 2.8 kB

  • Original 4.3 kB
  • After minification 4.3 kB
  • After compression 1.5 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 2.8 kB or 65% of the original size.

JavaScript Optimization

-2%

Potential reduce by 2.3 kB

  • Original 136.6 kB
  • After minification 136.6 kB
  • After compression 134.3 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

-0%

Potential reduce by 128 B

  • Original 59.3 kB
  • After minification 59.3 kB
  • After compression 59.2 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. Databaselecture.com has all CSS files already compressed.

Requests Breakdown

We found no issues to fix!

Requests Now

10

After Optimization

10

  • AJAX
  • JavaScript
  • CSS

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

Network Requests Diagram

databaselecture.com

databaselecture.com

148 ms

style1.css

style1.css

54 ms

i7iugcmrBJ8

i7iugcmrBJ8

120 ms

6xOADZBXU3c

6xOADZBXU3c

152 ms

qHF_u5EZv3I

qHF_u5EZv3I

218 ms

Fyenp0HFMWg

Fyenp0HFMWg

121 ms

27GvjSTaYtU

27GvjSTaYtU

117 ms

www-player.css

www-player.css

7 ms

www-embed-player.js

www-embed-player.js

36 ms

base.js

base.js

102 ms

embed.js

embed.js

43 ms

Accessibility Review

databaselecture.com accessibility score

85

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

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

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

databaselecture.com best practices score

83

Areas of Improvement

Trust and Safety

Impact

Issue

High

Does not use HTTPS

Low

Ensure CSP is effective against XSS attacks

General

Impact

Issue

High

Page has valid source maps

SEO Factors

databaselecture.com SEO score

73

Search Engine Optimization Advices

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 Databaselecture.com 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 Databaselecture.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

databaselecture.com

Open Graph description is not detected on the main page of Database Lecture. 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: