Processing time is defined as the duration between which two events?

The definition of processing time refers specifically to the duration between when a request is sent and when the complete response is received, which is best captured by the interval between the request start and the response end. This measurement reflects the total time taken by the server to process the request and send back a response, encompassing all server-side processing activities.

In this context, the choice indicating the duration between the DOM loading and the load event start would not accurately represent processing time, as it relates more to the client-side rendering and loading phase, not the server's processing capabilities. Thus, it does not align with the technical definition of processing time that is commonly referenced in performance monitoring and web transaction analysis.

Therefore, describing processing time as being measured from request start to response end aligns with the technical understanding and practical application in monitoring application performance within environments like Dynatrace.