I have set up performance monitoring, and enabled profiling on my latest versions. I are able to receive profiles but the Memory and CPU sections remain empty.

We only collect memory and CPU metrics at a roughly 100ms interval rate, meaning any profiles <200ms might have less than 2 metrics collected, which is not enough to render a chart. Therefore, your profile needs to have a duration of 200ms and above for us to be able to show you a graph on Memory or CPU usage.