CPU Time Slower in SQL Server 2014 than in SQL Server 2008
If you have not done so, I would highly recommend:

1.> Installing the right version of Integration Services for Hyper-V on the host and guest(like VMWare Tools). This alone can be a performance boost. 

2.> Within Hyper V manager, disable compatibility mode on the processors.

3.> Consider using a SCSI controller for data volumes.

4.> Consider disk sizes that are fixed rather than expanding.

Should you implement any of these techniques, I'd be interested in knowing if any performance improvement was gained.