1. The Governance Dashboard qvw and profile folders (config, QVX_LastRun, QVD_Historical) can all be placed on a network path.
2. The Dashboard must be installed on every server where it might be reloaded -- i.e. if you are reloading it using Publisher, you should install the Dashboard on all QDS servers that might reload the qvw.
3. If you are scanning QVWs across a network, you will experience some slowness due to latency and moving data across the network. The actual reload time will depend on network speed, but even more so on the size and quantity of files (QVW and log files) you are scanning. Can you describe a little what "stuck/hang" looks like? (for example, it keeps running after 90 minutes or 2 hours... or I get an error message...)