Thanks for this. We are getting our real hardware any day now so it will be interesting to see what happens.
After the original post we actually realized that after a restart of the system that particular query runs in milliseconds and gets progressively slower over time eventually reaching that 5-6 minutes time until we restart the Hana system again.
The basis team has said they are having other issues as well.
I will update this thread just for completeness after we get the real hardware and see what happens.
Thanks again.