Manual / help for bandwidth tester tool

I’ve been running the bandwidth tester tool and it works great between two Mikrotik boxes. However, this maxes out the CPU and it is recommended to test from client to client. I’m having problems with the windows client though when connecting to the MT or another Windows box. Sometimes I can only do transmit, sometimes only receive. Sometimes I can do tx/rx simultaneously but not to tx separately. Windows firewall is disabled on the testing computers. Is there a guide out there for this somewhere?

i doesnt work fine the bandwidth tool for windows. maybe mikrotik can help us.

All versions that I use recent than 2.8.4 I can’t use Btest include 2.9