Access jwst-docs.stsci.edu. JWST User Documentation Home

name

value

score

weighting

FCP (First Contentful Paint)

Value7.9 s

0/100

10%

LCP (Largest Contentful Paint)

Value9.0 s

1/100

25%

SI (Speed Index)

Value7.9 s

22/100

10%

TBT (Total Blocking Time)

Value2,120 ms

7/100

30%

CLS (Cumulative Layout Shift)

Value0.004

100/100

15%

TTI (Time to Interactive)

Value10.2 s

25/100

10%

jwst-docs.stsci.edu

111 ms

jwst-docs.stsci.edu

557 ms

js

281 ms

batch.js

249 ms

batch.js

247 ms

Our browser made a total of 78 requests to load all elements on the main page. We found that 85% of them (66 requests) were addressed to the original Jwst-docs.stsci.edu, 8% (6 requests) were made to Fonts.gstatic.com and 3% (2 requests) were made to Google-analytics.com. The less responsive or slowest element that took the longest time to load (557 ms) belongs to the original domain Jwst-docs.stsci.edu.

Content Size

783.3 kB

After Optimization

312.3 kB

In fact, the total size of Jwst-docs.stsci.edu main page is 783.3 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. 70% of websites need less resources to load. HTML takes 354.0 kB which makes up the majority of the site volume.

HTML Optimization

-93%

Potential reduce by 330.2 kB

Original 354.0 kB
After minification 211.4 kB
After compression 23.8 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 142.6 kB, which is 40% 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 330.2 kB or 93% of the original size.

Image Optimization

-67%

Potential reduce by 113.6 kB

Original 170.1 kB
After minification 56.5 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, JWST Docs Stsci needs image optimization as it can save up to 113.6 kB or 67% of the original volume. The most popular and efficient tools for JPEG and PNG image optimization are Jpegoptim and PNG Crush.

JavaScript Optimization

-7%

Potential reduce by 7.2 kB

Original 106.3 kB
After minification 106.3 kB
After compression 99.1 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

-13%

Potential reduce by 20.1 kB

Original 153.0 kB
After minification 152.9 kB
After compression 132.9 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. Jwst-docs.stsci.edu needs all CSS files to be minified and compressed as it can save up to 20.1 kB or 13% of the original size.

Requests Now

After Optimization

The browser has sent 70 CSS, Javascripts, AJAX and image requests in order to completely render the main page of JWST Docs Stsci. We recommend that multiple CSS and JavaScript files should be merged into one by each type, as it can help reduce assets requests from 36 to 1 for JavaScripts and from 20 to 1 for CSS and as a result speed up the page load time.

Accessibility Issues

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 interpretation of your content by users in different locales.

High

<html> element does not have a [lang] attribute

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

High

Links do not have a discernible name

These items highlight common accessibility best practices.

High

[user-scalable="no"] is used in the <meta name="viewport"> element or the [maximum-scale] attribute is less than 5.

Areas of Improvement

High

Does not use HTTPS

High

Includes front-end JavaScript libraries with known security vulnerabilities

Low

Ensure CSP is effective against XSS attacks

Low

Detected JavaScript libraries

High

Browser errors were logged to the console

High

Missing source maps for large first-party JavaScript

Search Engine Optimization Advices

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

High

Links are not crawlable

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

High

Image elements do not have [alt] attributes

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

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 Jwst-docs.stsci.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 Jwst-docs.stsci.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

jwst-docs.stsci.edu

Open Graph description is not detected on the main page of JWST Docs Stsci. 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

JWST User Documentation Home - JWST User Documentation

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

jwst-docs.stsci.edu

jwst-docs.stsci.edu

js

batch.js

batch.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

jwst-docs.stsci.edu

jwst-docs.stsci.edu

js

batch.js

batch.js

com.atlassian.auiplugin:split_aui.component.form.select2.js

com.atlassian.confluence.editor:page-editor-soy.js

com.atlassian.confluence.plugins.drag-and-drop:files-upload-analytics.js

com.atlassian.confluence.editor:panel-components.js

confluence.web.resources:dictionary.js

confluence.web.resources:macro-js-overrides.js

com.atlassian.confluence.plugins.confluence-ui-components:space-picker.js

com.atlassian.auiplugin:split_aui.splitchunk.vendors--02a4084a95.js

com.atlassian.auiplugin:split_aui.splitchunk.vendors--ec56cc9135.js

com.atlassian.auiplugin:split_aui.component.form.date-select.js

confluence.web.resources:date-picker.js

com.atlassian.confluence.plugins.confluence-ui-components:space-page-picker.js

com.atlassian.confluence.plugins.confluence-ui-components:page-picker.js

com.atlassian.confluence.plugins.confluence-ui-components:label-picker.js

com.atlassian.confluence.plugins.confluence-ui-components:include-exclude-picker.js

com.atlassian.confluence.plugins.confluence-ui-components:user-group-select2.js

com.atlassian.confluence.plugins.confluence-ui-components:cql.js

com.atlassian.confluence.plugins.confluence-create-content-plugin:user-select2.js

com.atlassian.confluence.plugins.confluence-macro-browser:macro-browser-js.js

com.atlassian.confluence.plugins.confluence-frontend:split_vendors~moment.js

com.atlassian.confluence.plugins.confluence-frontend:split_moment.js

com.atlassian.confluence.editor:collaborative-helper.js

com.atlassian.confluence.editor:page-editor-js.js

com.atlassian.auiplugin:split_aui.component.progressbar.js

confluence.web.resources:draft-changes-js.js

edu.stsci.confluence.jdox.macros.JDoxMacros:JDoxMacros-resources.js

com.atlassian.auiplugin:split_aui.pattern.forms.js

edu.stsci.confluence.jdox.CustomPageTree:CustomPageTree-resources.js

com.k15t.scroll.scroll-viewport:resource-editor-resource-omitter.js

com.k15t.scroll.scroll-viewport:resource-quick-reload-manager-disabler.js

batch.css

batch.css

com.atlassian.auiplugin:split_aui.component.form.select2.css

vue

font-awesome.min.css

com.atlassian.confluence.plugins.confluence-ui-components:space-picker.css

com.atlassian.auiplugin:split_aui.component.form.date-select.css

com.atlassian.confluence.plugins.confluence-ui-components:space-page-picker.css