QAccessible::uniqueId causes massive slowdowns

As soon as a touch enabled device is attached and the Tablet-PC-Service is running on Windows 7 (same with Windows 8 but the service is named differently) , the QAccessible becomes active and can cause massive performance issues like having to wait for about 30 seconds when clicking on an treeview item.
I have attached Vtune to figure out where the time is spend and it showed that about 16 seconds were spend in QAccessible::uniqueId, which was called about 94k times in my case and another 18 seconds were spend in QHashData::nextNode, which was called by QAccessible::uniqueId and was called about 1.4 billion times.

Disabling the Tablet-PC-Service in Windows and therefore disabling QAccessible fixes this slowdown.