PagespeedApiImageV2PageRect: The region of the page that is captured by this image, with dimensions measured in CSS pixels.

ResultFormattedResults: Localized PageSpeed results.

ResultFormattedResultsRuleResults: The enum-like identifier for this rule.

ResultPageStats: Summary statistics for the page, such as number of JavaScript bytes, number of HTML bytes, etc.

ResultRuleGroups: The name of this rule group: one of "SPEED" or "USABILITY".

ResultVersion: The version of PageSpeed used to generate these results.