Comment 6 for bug 1642105

From the scheduler theory, a real-time thread should not be suspended by any other thread.
It should run very deterministic and independent from what else is going on in the machine.

Since this seams to be not the case, we may have still locking calls, or it is an CPU frequency scaling issue, or it is just some extra engine work wen loading a track.

Your AMD A4-3300M has a frequency scaling 1900 - 2500 MHz.
If I read it right, it lowers the frequency to 1900 MHz if both cores are used. This is most likely the case if both cores are used.

This issue become worth when we consider hyper-threading (not the case here)

It could be interesting to lock the cpu clock on 1900 MHz and check how the issue behaves than.