Английская Википедия:Google PageSpeed Tools

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Шаблон:Short description Шаблон:Multiple issues Google PageSpeed is a family of tools by Google Inc, designed to help a website's performance optimizations. It was introduced at Developer Conference in 2010. There are four main components of PageSpeed family tools: PageSpeed Module, consisting of mod PageSpeed for the Apache HTTP Server and ngx PageSpeed for the Nginx, PageSpeed Insights, PageSpeed Service, and PageSpeed Chrome DevTools extension. All of these components are built to identify the faults in a website's compliance with Google's Web Performance Best Practices, and automate the optimization process.

PageSpeed Modules

The PageSpeed Modules are the open-source Apache HTTP Server or Nginx web server modules, which automatically apply chosen filters to pages and associated assets, such as stylesheets, JavaScript, and HTML files, as well as to images and website cache requirements. These modules do not require modifications to existing content or workflow, meaning that all internal optimizations and changes to files are made on the server side, presenting modified files directly to the user. Each of the 40+ filters corresponds to one of Google's web performance best practices rules.

Since PageSpeed module is an open source library, it is frequently updated by numerous developers from all over the world and can be deployed by any individual sites, hosting providers, or CDNs.

The installation can be done in two ways: from packages or build from source on the following supported platforms:

• Fedora/Rocky, both 32-bit and 64-bit
• Debian/Ubuntu, both 32-bit and 64-bit

Ports

Other servers that offer a PageSpeed optimization module based on Google's Page Speed SDK:

• Apache Traffic Server - ATS page speed
• Microsoft Internet Information Services - IIS WebSpeed

Filters

PageSpeed module filters are settings, based on which a webpage optimization rule is applied. They can be divided into five main categories:

• Stylesheets optimizations;
• Javascript files optimizations;
• Images optimizations;
• HTML optimizations;
• Tracking activity filters.

Speed impact

The PageSpeed Module showed the most significant impact on decreasing webpage loading times, payload size, and number of requests when compared to other options in the industry. According to several researchers, mod_pagespeed can reduce loading times by up to 80%, amount of bytes on a wire can be decreased by 30% and the number of total requests can drop by over 20%. Since many search engines, including Google, employ a ranking algorithm which is affected by a page's loading speed, these optimizations can impact a website's placement in search results. As of February 2015, Google has begun testing “Slow” labels on mobile devices for websites that exceed a certain amount of loading time, prompting developers to examine ways to increase a page's load speed.

PageSpeed Insights

PageSpeed Insights is an online synthetic benchmark tool which helps in identifying performance best practices on any single URL, provides suggestions on a webpage's optimizations, and suggests overall ideas of how to make a website faster. This tool can be accessed directly in any browser. Per URL request, it grades webpage performance on a scale from 1 to 100 and provides a report on suggested optimizations, divided into categories of high (score > 80, indicating most best practices have been implemented and there is little headroom for improvement), medium (between 60 and 79- indicating that the page is missing some common optimizations there is some headroom for optimization), and low priorities( Score below 60, indicating a non-optimized page)-About PageSpeed Insights

Currently, the Page Speed Insight score is calculated on the basis of five factors:

1. First Contentful Paint (FCP)- 10%
2. Speed Index (SI)- 10%
3. Largest Contentful Paint (LCP)- 25%
4. Total Blocking Time (TBT)- 30%
5. Cumulative Layout Shift (CLS)- 25%

Recent versions of PageSpeed Insights added support for measuring real-world user experience using the Chrome User Experience Report. Google Chrome's Elizabeth Sweeny and Addy Osmani lead PageSpeed Insights and announced its support for Core Web Vitals in 2020.

PageSpeed Chrome Extension

Pagespeed extension is an extension of Chrome Browser and is a part of Google Chrome Developer Tools. Visitors who use PageSpeed regularly can view all given metrics by PageSpeed Insights directly in a browser and download webpage resources, optimized according to web performance best practices. It has now been deprecated and Google recommends the online version be used instead.

PageSpeed Service

PageSpeed service was a commercial product, provided by Google Inc. The service was offered free of charge, since it was still officially in beta version. Service included all Pagespeed Module optimizations and use of Google servers’ infrastructure. Google announced the deprecation of PageSpeed service on 5 May 2015 and turned it off on 3 August 2015.

See also

• Google Optimize

External links

• Page Speed Insights
• web.dev Measure