Access openlibrary.org. Welcome to Open Library

name

value

score

weighting

FCP (First Contentful Paint)

Value1.7 s

91/100

10%

LCP (Largest Contentful Paint)

Value6.2 s

11/100

25%

SI (Speed Index)

Value4.5 s

73/100

10%

TBT (Total Blocking Time)

Value1,770 ms

10/100

30%

CLS (Cumulative Layout Shift)

Value0.031

100/100

15%

TTI (Time to Interactive)

Value7.2 s

50/100

10%

openlibrary.org

236 ms

openlibrary.org

667 ms

page-home.css

129 ms

donate.js

260 ms

analytics.js

232 ms

Our browser made a total of 131 requests to load all elements on the main page. We found that 35% of them (46 requests) were addressed to the original Openlibrary.org, 40% (52 requests) were made to Covers.openlibrary.org and 7% (9 requests) were made to Ia800505.us.archive.org. The less responsive or slowest element that took the longest time to load (1.6 sec) relates to the external source Covers.openlibrary.org.

Content Size

1.3 MB

After Optimization

1.0 MB

In fact, the total size of Openlibrary.org main page is 1.3 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. 55% of websites need less resources to load. Images take 810.9 kB which makes up the majority of the site volume.

HTML Optimization

-84%

Potential reduce by 240.1 kB

Original 287.0 kB
After minification 270.8 kB
After compression 46.9 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 240.1 kB or 84% of the original size.

Image Optimization

-4%

Potential reduce by 33.9 kB

Original 810.9 kB
After minification 777.0 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. Open Library images are well optimized though.

JavaScript Optimization

-17%

Potential reduce by 36.6 kB

Original 210.3 kB
After minification 210.3 kB
After compression 173.7 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 36.6 kB or 17% of the original size.

CSS Optimization

-22%

Potential reduce by 2.1 kB

Original 9.9 kB
After minification 9.9 kB
After compression 7.8 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. Openlibrary.org needs all CSS files to be minified and compressed as it can save up to 2.1 kB or 22% of the original size.

Requests Now

After Optimization

The browser has sent 98 CSS, Javascripts, AJAX and image requests in order to completely render the main page of Open Library. We recommend that multiple CSS and JavaScript files should be merged into one by each type, as it can help reduce assets requests from 8 to 1 for JavaScripts and as a result speed up the page load time.

Accessibility Issues

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.

High

ARIA input fields do not have accessible names

These are opportunities to improve the legibility of your content.

High

Background and foreground colors do not have a sufficient contrast ratio.

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.

High

Image elements do not have [alt] attributes

Areas of Improvement

High

Does not use HTTPS

Low

Ensure CSP is effective against XSS attacks

High

Serves images with low resolution

Low

Detected JavaScript libraries

High

Page has valid source maps

Search Engine Optimization Advices

Format your HTML in a way that enables crawlers to better understand your app’s content.

High

Links do not have descriptive text

High

Image elements do not have [alt] attributes

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

High

Links are not crawlable

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/).

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 Openlibrary.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 Openlibrary.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

openlibrary.org

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

Report Summary

Performance

Accessibility

Best Practices

SEO

Welcome to Open Library | Open Library

Page Load Speed

First Response

Resources Loaded

Page Rendered

About Website

Key Findings

Performance Metrics

Measured Metrics

FCP (First Contentful Paint)

LCP (Largest Contentful Paint)

SI (Speed Index)

TBT (Total Blocking Time)

CLS (Cumulative Layout Shift)

TTI (Time to Interactive)

Network Requests Diagram

openlibrary.org

openlibrary.org

page-home.css

donate.js

analytics.js

Page Optimization Overview & Recommendations

Content Size

After Optimization

HTML Optimization

Image Optimization

JavaScript Optimization

CSS Optimization

Requests Breakdown

Requests Now

After Optimization

Network Requests Diagram

openlibrary.org

openlibrary.org

page-home.css

donate.js

analytics.js

all.js

bwb_P8-AFB-279

ia-logo.svg

language-icon.svg

openlibrary-logo-tighter.svg

down-arrow.png

hamburger-icon.svg

read.png

reading_goal.svg

track.png

library_explorer.png

fulltext.png

librarian.png

volunteer.png

feedback.png

art.svg

science_fiction.svg

fantasy.svg

biographies.svg

recipes.svg

romance.svg

textbooks.svg

children.svg

history.svg

medicine.svg

religion.svg

mystery_and_detective_stories.svg

plays.svg

music.svg

science.svg

tweet.svg

github.svg

pantheon.png

14315081-M.jpg

6717853-M.jpg

9269962-M.jpg

12648183-M.jpg

8463846-M.jpg