Dear Piya

Please refer to the response as below:

DOM Interactive graph
Displays the average time per document, in milliseconds, from when the user agent starts establishing the connection to
the server until the user agent sets the readiness of the current document to "interactive".
(that is when the user enters a URL in the address bar until the page is ready for the user to interact)

DOMContentLoaded Event
Displays the average time per document, in milliseconds, it takes to handle the DOM Content Loaded event
(that is the time from when when the initial HTML document has been completely loaded and parsed, without waiting for stylesheets, images, and subframes to finish loading)

Page Load Event Duration
Displays the average time per document, in milliseconds, it takes to handle the Page Load event as a final step in every page load the browser fires
(that is the time from when the whole page has loaded, including all dependent resources such as stylesheets and images. This is in contrast to DOMContentLoaded,
which is fired as soon as the page DOM has been loaded, without waiting for resources to finish loading)

Regards,
Kate