Simple Performance Instrumentation

Is there an GUIID like property in the request and response objects that can be used to calculate request start time, response start time, and response end time (and then log that one record somewhere)

There isn’t a Guid property per request, although not sure how you intended to use it here.

But you can profile requests with the built-in Mini Profiler otherwise if you register an IRequestLogger it will be called with the request duration of the time the Service took to execute. Here’s more info about the built-in Request Loggers.