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Redirects introduce additional delays before the page can be loaded

The maximum potential First Input Delay that your users could experience is the duration of the longest task

Cumulative Layout Shift measures the movement of visible elements within the viewport

This is the largest contentful element painted within the viewport

Sum of all time periods between FCP and Time to Interactive, when task length exceeded 50ms, expressed in milliseconds

If your robots.txt file is malformed, crawlers may not be able to understand how you want your website to be crawled or indexed

Time to interactive is the amount of time it takes for the page to become fully interactive

All sites should be protected with HTTPS, even ones that don't handle sensitive data. This includes avoiding [mixed content](https://developers.google.com/web/fundamentals/security/prevent-mixed-content/what-is-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

Network round trip times (RTT) have a large impact on performance. If the RTT to an origin is high, it's an indication that servers closer to the user could improve performance

First Meaningful Paint measures when the primary content of a page is visible

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

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

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

These DOM elements contribute most to the CLS of the page.

Speed Index shows how quickly the contents of a page are visibly populated

Keep the server response time for the main document short because all other requests depend on it

Server latencies can impact web performance. If the server latency of an origin is high, it's an indication the server is overloaded or has poor backend performance

First Contentful Paint marks the time at which the first text or image is painted

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. With proper service worker and manifest implementations, browsers can proactively prompt users to add your app to their homescreen, which can lead to higher engagement

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

A large DOM will increase memory usage, cause longer [style calculations](https://developers.google.com/web/fundamentals/performance/rendering/reduce-the-scope-and-complexity-of-style-calculations), and produce costly [layout reflows](https://developers.google.com/speed/articles/reflow)

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

Large network payloads cost users real money and are highly correlated with long load times

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

Largest Contentful Paint marks the time at which the largest text or image is painted