First Input Delay (FID)

First Input Delay (FID) measures the time from when a user first interacts with your page (e.g., by clicking a link, tapping on a button, or typing in a form field) to the time when the browser is able to respond to that interaction. This metric is crucial for evaluating how quickly a page becomes interactive and responsive to user inputs.

What is FID?

FID measures the latency between a user's first interaction and the browser's response to that interaction. It reflects the responsiveness of a page, specifically how quickly it reacts to user inputs. A low FID indicates that the page is responsive and that users can interact with it smoothly, while a high FID indicates delays in the page's responsiveness.

Why FID Matters for Page Speed

FID is a key metric for assessing the interactivity of your page. If a page has a high FID, it means users experience delays when interacting with the page, leading to frustration and potential abandonment. A fast FID improves the user experience by ensuring that interactions are processed quickly, making the page feel more responsive and user-friendly.

Impact on SEO

Search engines consider user experience signals like FID when ranking pages. A high FID can negatively impact your SEO by providing a poor user experience. Google and other search engines prioritize pages that offer a smooth, responsive experience. Reducing FID can contribute to better search engine rankings and improved overall site performance.

How to Improve FID

To enhance FID, consider the following strategies:

  • Minimize JavaScript Execution Time: Reduce the amount of JavaScript that needs to be processed and executed, especially on initial load. Break up long tasks and defer non-essential scripts.
  • Optimize Main Thread Work: Ensure that the main thread is not blocked by lengthy tasks. Offload heavy computations to web workers or use asynchronous processing where possible.
  • Reduce Third-Party Script Impact: Limit the use of third-party scripts or ensure they are optimized to minimize their impact on responsiveness.
  • Prioritize Critical JavaScript: Load critical JavaScript for initial interactions early and defer less important scripts to avoid delays in interactivity.
  • Minimize Main Thread Blocking: Avoid using long-running tasks and large scripts that can block the main thread and delay user interactions.

Improving FID ensures that users experience immediate responsiveness when interacting with your page, leading to a better user experience and potentially higher SEO rankings.

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Speed Index

Measures how quickly the content of a page is visually displayed. A good Speed Index is less than 4.3 seconds.

Internal and External Links

The number of links within your site and to other websites.

Largest Contentful Paint (LCP)

Measures loading performance. To provide a good user experience, LCP should occur within 2.5 seconds of when the page first starts loading.

Core Web Vitals

We measure key performance metrics to ensure a good user experience.

Cumulative Layout Shift (CLS)

Measures visual stability. To provide a good user experience, pages should maintain a CLS of less than 0.1.

Keyword Density

The frequency of single words and two-word phrases, helping you understand your content focus.

First Input Delay (FID)

Measures interactivity. To provide a good user experience, pages should have an FID of less than 100 milliseconds.

First Contentful Paint (FCP)

Marks the time at which the first text or image is painted. FCP is an important, user-centric metric for measuring perceived load speed.

Headings

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Images

We count the total images and those with alt text, which is important for accessibility and SEO.

Total Blocking Time (TBT)

Measures the total amount of time that a page is blocked from responding to user input, such as mouse clicks, screen taps, or keyboard presses.

Page Speed Analysis

We evaluate several metrics that affect your page's loading speed and user experience.

SEO Score

An overall rating of your website's SEO health, calculated based on various factors.

SSL Certificate

We check if your site uses HTTPS, which is important for security and SEO.

Time to Interactive (TTI)

Measures how long it takes for the page to become fully interactive. A good TTI is within 5 seconds of page load.

Title and Meta Description

We check if your page has a title and meta description, and evaluate their length and relevance.

Broken Links

We identify any broken links on your page, which can negatively impact user experience and SEO.

Top Words

The most frequently used words on your page, which can indicate your main topics.

Word Count

The total number of words on your page. Search engines generally prefer content-rich pages.

Use this information to optimize your website, improve your search engine rankings, and provide a better experience for your visitors.