universitetrzd.ru - Корпоративный университет РЖД

Universitetrzd.ru Site Title

Корпоративный университет РЖД

Universitetrzd.ru Test Results

Universitetrzd.ru Mobile Performance: 51/100

Quick overview:

Diagnostics

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

Reduce unused JavaScript

Est savings of 209 KiB

Reduce unused JavaScript and defer loading scripts until they are required to decrease bytes consumed by network activity. Learn how to reduce unused JavaScript.

Avoid an excessive DOM size

2,174 elements

A large DOM will increase memory usage, cause longer style calculations, and produce costly layout reflows. Learn how to avoid an excessive DOM size.

Serve images in next-gen formats

Est savings of 264 KiB

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

Reduce unused CSS

Est savings of 50 KiB

Reduce unused rules from stylesheets and defer CSS not used for above-the-fold content to decrease bytes consumed by network activity. Learn how to reduce unused CSS.

Largest Contentful Paint element

8,910 ms

This is the largest contentful element painted within the viewport. Learn more about the Largest Contentful Paint element

Avoid serving legacy JavaScript to modern browsers

Est savings of 26 KiB

Polyfills and transforms enable legacy browsers to use new JavaScript features. However, many aren't necessary for modern browsers. Consider modifying your JavaScript build process to not transpile Baseline features, unless you know you must support legacy browsers. Learn why most sites can deploy ES6+ code without transpiling

Eliminate render-blocking resources

Est savings of 1,270 ms

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

Avoid large layout shifts

15 layout shifts found

These are the largest layout shifts observed on the page. Each table item represents a single layout shift, and shows the element that shifted the most. Below each item are possible root causes that led to the layout shift. Some of these layout shifts may not be included in the CLS metric value due to windowing. Learn how to improve CLS

Reduce the impact of third-party code

Third-party code blocked the main thread for 430 ms

Third-party code can significantly impact load performance. Limit the number of redundant third-party providers and try to load third-party code after your page has primarily finished loading. Learn how to minimize third-party impact.

Avoid multiple page redirects

Est savings of 630 ms

Redirects introduce additional delays before the page can be loaded. Learn how to avoid page redirects.

Minimize main-thread work

3.1 s

Consider reducing the time spent parsing, compiling and executing JS. You may find delivering smaller JS payloads helps with this. Learn how to minimize main-thread work

Reduce JavaScript execution time

1.5 s

Consider reducing the time spent parsing, compiling, and executing JS. You may find delivering smaller JS payloads helps with this. Learn how to reduce Javascript execution time.

Serve static assets with an efficient cache policy

42 resources found

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

Image elements do not have explicit `width` and `height`

Set an explicit width and height on image elements to reduce layout shifts and improve CLS. Learn how to set image dimensions

Properly size images

Est savings of 85 KiB

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

Efficiently encode images

Est savings of 15 KiB

Optimized images load faster and consume less cellular data. Learn how to efficiently encode images.

Minify CSS

Est savings of 3 KiB

Minifying CSS files can reduce network payload sizes. Learn how to minify CSS.

Legacy JavaScript

Est savings of 92 KiB

Improve image delivery

Est savings of 332 KiB

Reducing the download time of images can improve the perceived load time of the page and LCP. Learn more about optimizing image size

LCP request discovery

Optimize LCP by making the LCP image discoverable from the HTML immediately, and avoiding lazy-loading

Optimize DOM size

A large DOM can increase the duration of style calculations and layout reflows, impacting page responsiveness. A large DOM will also increase memory usage. Learn how to avoid an excessive DOM size.

Use efficient cache lifetimes

Est savings of 348 KiB

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

Forced reflow

Many APIs, typically reading layout geometry, force the rendering engine to pause script execution in order to calculate the style and layout. Learn more about forced reflow and its mitigations.

Layout shift culprits

Layout shifts occur when elements move absent any user interaction. Investigate the causes of layout shifts, such as elements being added, removed, or their fonts changing as the page loads.

Render blocking requests

Requests are blocking the page's initial render, which may delay LCP. Deferring or inlining can move these network requests out of the critical path.

Document request latency

Your first network request is the most important. Reduce its latency by avoiding redirects, ensuring a fast server response, and enabling text compression.

Max Potential First Input Delay

320 ms

The maximum potential First Input Delay that your users could experience is the duration of the longest task. Learn more about the Maximum Potential First Input Delay metric.

Time to Interactive

9.0 s

Time to Interactive is the amount of time it takes for the page to become fully interactive. Learn more about the Time to Interactive metric.

Universitetrzd.ru 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 about the meta description.

Universitetrzd.ru Mobile Best Practices: 83/100

Quick overview:

General

Missing source maps for large first-party JavaScript

Source maps translate minified code to the original source code. This helps developers debug in production. In addition, Lighthouse is able to provide further insights. Consider deploying source maps to take advantage of these benefits. Learn more about source maps.

Trust and Safety

Does not use HTTPS

1 insecure request 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 served over 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 about HTTPS.

Universitetrzd.ru Mobile Accessibility: 87/100

Quick overview:

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.

Form elements do not have associated labels

Labels ensure that form controls are announced properly by assistive technologies, like screen readers. Learn more about form element labels.

Links do not have a discernible name

Link text (and alternate text for images, when used as links) that is discernible, unique, and focusable improves the navigation experience for screen reader users. Learn how to make links accessible.

Best practices

These items highlight common accessibility best practices.

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

Disabling zooming is problematic for users with low vision who rely on screen magnification to properly see the contents of a web page. Learn more about the viewport meta tag.

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