mit.edu - MIT - Massachusetts Institute of Technology

Mit.edu Site Title

MIT - Massachusetts Institute of Technology

Mit.edu Test Results

Mit.edu Mobile Performance: 63/100

Quick overview:

Opportunities

These suggestions can help your page load faster. They don't directly affect the Performance score.

Serve images in next-gen formats. Potential savings of 200 KiB

Image formats like JPEG 2000, JPEG XR, and WebP often provide better compression than PNG or JPEG, which means faster downloads and less data consumption. Learn more.

Remove unused JavaScript. Potential savings of 208 KiB

Remove unused JavaScript to reduce bytes consumed by network activity. Learn more.

Enable text compression. Potential savings of 218 KiB

Text-based resources should be served with compression (gzip, deflate or brotli) to minimize total network bytes. Learn more.

Efficiently encode images. Potential savings of 131 KiB

Optimized images load faster and consume less cellular data. Learn more.

Eliminate render-blocking resources. Potential savings of 250 ms

Resources are blocking the first paint of your page. Consider delivering critical JS/CSS inline and deferring all non-critical JS/styles. Learn more.

Remove unused CSS. Potential savings of 24 KiB

Remove dead rules from stylesheets and defer the loading of CSS not used for above-the-fold content to reduce unnecessary bytes consumed by network activity. Learn more.

Properly size images. Potential savings of 28 KiB

Serve images that are appropriately-sized to save cellular data and improve load time. Learn more.

Diagnostics

More information about the performance of your application. These numbers don't directly affect the Performance score.

Ensure text remains visible during webfont load

Leverage the font-display CSS feature to ensure text is user-visible while webfonts are loading. Learn more.

Serve static assets with an efficient cache policy

10 resources found

A long cache lifetime can speed up repeat visits to your page. Learn more.

Minimize main-thread work

2.3 s

Consider reducing the time spent parsing, compiling and executing JS. You may find delivering smaller JS payloads helps with this. Learn more

JavaScript execution time

1.3 s

Consider reducing the time spent parsing, compiling, and executing JS. You may find delivering smaller JS payloads helps with this. Learn more.

Avoid long main-thread tasks

6 long tasks found

Lists the longest tasks on the main thread, useful for identifying worst contributors to input delay. Learn more

Keep request counts low and transfer sizes small

25 requests • 838 KiB

To set budgets for the quantity and size of page resources, add a budget.json file. Learn more.

Avoid chaining critical requests

6 chains found

The Critical Request Chains below show you what resources are loaded with a high priority. Consider reducing the length of chains, reducing the download size of resources, or deferring the download of unnecessary resources to improve page load. Learn more.

Largest Contentful Paint element

1 element found

This is the largest contentful element painted within the viewport. Learn More

Mit.edu Mobile SEO: 92/100

Quick overview:

Content Best Practices

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

Document does not have a meta description

Meta descriptions may be included in search results to concisely summarize page content. Learn more.

Mit.edu Mobile Best Practices: 77/100

Quick overview:

General

Browser errors were logged to the console

Errors logged to the console indicate unresolved problems. They can come from network request failures and other browser concerns. Learn more

Trust and Safety

Does not use HTTPS

17 insecure requests found

All sites should be protected with HTTPS, even ones that don't handle sensitive data. This includes avoiding mixed content, where some resources are loaded over HTTP despite the initial request being servedover HTTPS. HTTPS prevents intruders from tampering with or passively listening in on the communications between your app and your users, and is a prerequisite for HTTP/2 and many new web platform APIs. Learn more.

Links to cross-origin destinations are unsafe

Add `rel="noopener"` or `rel="noreferrer"` to any external links to improve performance and prevent security vulnerabilities. Learn more.

Mit.edu Mobile Progressive Web App: 43/100

Quick overview:

PWA Optimized

Does not set a theme color for the address bar.

The browser address bar can be themed to match your site. Learn more. Failures: No manifest was fetched.

Manifest doesn't have a maskable icon

A maskable icon ensures that the image fills the entire shape without being letterboxed when installing the app on a device. Learn more. No manifest was fetched

Does not redirect HTTP traffic to HTTPS

If you've already set up HTTPS, make sure that you redirect all HTTP traffic to HTTPS in order to enable secure web features for all your users. Learn more.

Is not configured for a custom splash screen

A themed splash screen ensures a high-quality experience when users launch your app from their homescreens. Learn more. Failures: No manifest was fetched.

Fast and reliable

Current page does not respond with a 200 when offline

If you're building a Progressive Web App, consider using a service worker so that your app can work offline. Learn more.

`start_url` does not respond with a 200 when offline

A service worker enables your web app to be reliable in unpredictable network conditions. Learn more. No usable web app manifest found on page.

Installable

Does not register a service worker that controls page and `start_url`

The service worker is the technology that enables your app to use many Progressive Web App features, such as offline, add to homescreen, and push notifications. Learn more.

Web app manifest does not meet the installability requirements

Browsers can proactively prompt users to add your app to their homescreen, which can lead to higher engagement. Learn more. Failures: No manifest was fetched.

Does not use HTTPS

17 insecure requests found

Mit.edu Mobile Accessibility: 99/100

Quick overview:

Navigation

These are opportunities to improve keyboard navigation in your application.

Heading elements are not in a sequentially-descending order

Properly ordered headings that do not skip levels convey the semantic structure of the page, making it easier to navigate and understand when using assistive technologies. Learn more.

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