Published disk-intensive applications slow down significantly compared with them running locally.
Starting from Windows Server 2012R2, Microsoft has added mechanism for fair sharing of RDSH resources between Remote Desktop users. In some cases it may affect performance of disk-intensive apps, especially during their startup.
It gets enabled by default after installing Remote Desktop Services role.
Please consider disabling them if Fair Share doesn't work well in your case.
1. Set the following registry values to 0 on the RDS hosts:
2. Reboot the RDS hosts.