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The PSI (PageSpeed Insights) API records and reports the on page statistics for desktop and smartphone devices performance on a page. It also provides suggestions for improvement. On top of the report, PSI provides a Page performance score. The score below 50 is considered slow. The score between 50 to 90 is considered average and an above 90 score is considered rapid. PSI informs on page field as well as laboratory information to the user. Laboratory data is carefully collected in a controlled environment for debugging purposes. Though it cannot capture the real-life critical issues. Field data is helpful in capturing real-life scenarios in the real world on a limited number of metrics.