Hi Lars.
Interesting results and graphs. (I will point some of our developers here to have a look at it.)
The results can be influenced by many different parameters like video encoding, CPU-utilization, network and endpoint performance.
It does sound like you have close to a perfect setup (a P45 is the fastest performing client currently).
If you would like to analyze the results even more I can recommend this utility:
What it the end-goal here and reasons for doing the test?
// Linjo