Meteor Velocity starting Mirror is slow

Question

I'm trying to create some unit test with Mocha and Velocity. however when i go to my webpage and click the velocity bullet, I get the message "mocha - mirror starting".

It is stuck there for around 10min, however CPU is hitting 100% so it is doing something, when i look in the logs i don't find anything. When i browse to the location where Velocity is started, I get an empty response. After that it bubbles up, but this is not acceptable. Unit test are supposed to be fast...

I20151223-11:43:59.571(1)? [velocity] * Meteor Tools is installing *

I20151223-11:43:59.572(1)? This takes a few minutes the first time.

I20151223-11:43:59.572(1)? [velocity] You can see the mirror logs at: tail -f D:\Work\coderepository\meteor\sandwich-app.meteor\local\log\mocha.log

I20151223-11:52:36.853(1)? mocha: 2 tests passed (11ms)

Any help? I'm running on a Windows 10 machine. I'm new to Meteor and Velocity so I could be doing something wrong. I only have the sample-tests added...

I tried to run meteor in debug mode, but this doesn't add any more information into the mocha.log file

Rob