The Performance Information endpoint returns a comprehensive audit of a web page's performance, including metrics like startup time, CPU usage, JavaScript execution time, caching efficiency, and layout stability indicators such as cumulative layout shift (CLS) and first contentful paint (FCP).

Key fields in the response data include total block time (TBT), number of scripts and requests, JavaScript execution time, caching details, and layout shift metrics. Each field provides insights into specific performance aspects of the analyzed web page.

The response data is structured in a JSON format, with distinct sections for performance metrics, caching analysis, and layout stability. Each section contains relevant fields that detail the performance characteristics of the requested URL.

The Performance Information endpoint accepts parameters such as the target URL for analysis. Users can customize their requests by specifying additional options, such as the type of metrics they wish to focus on, if supported.

Typical use cases include optimizing website speed, improving user experience, identifying performance bottlenecks, and enhancing SEO rankings. Developers and businesses can leverage the data to prioritize optimizations and monitor performance over time.

Data accuracy is maintained through real-time analysis and advanced metrics collection techniques. The API employs standardized performance measurement protocols to ensure that the metrics reflect the actual performance of the web page being analyzed.

Users can utilize the returned data by analyzing key performance metrics to identify areas for improvement. For example, high JavaScript execution times may indicate the need for script optimization, while significant layout shifts could prompt a review of CSS practices.

Standard data patterns include consistent metrics for similar types of web pages, such as e-commerce sites typically showing higher script counts and layout shifts. Users can expect variations based on page complexity, content type, and optimization efforts.

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When you subscribe to an API free trial, you can make up to 50 API calls. If you wish to make additional API calls beyond this limit, the API will prompt you to perform an "Start Your Paid Plan." You can find the "Start Your Paid Plan" button in your profile under Subscription -> Choose the API you are subscribed to -> Pricing tab.

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