Hi NorbertR,
When testing on the same vlan the test would run at LAN speeds e.g. 1 Gbps. When testing through Wanos with the default license the test speed will be 1 Mbps WAN simulation. The 1 Mbps limit is imposed by the license after compression. So the end to end speed might be 10 Mbps, but on the WAN 1 Mbps is allowed.
Taking out the WAN Simulation and running the test on the same VLAN is going to produce LAN speeds, so the result as described by the OP is expected.