Once you open the browser, after a few minutes the entire work station hangs and you have to start another instance. This has happened every time I have tried using it on Ryzen.
Also the performance of station is really weak. For example, you experience lag at every page. On Intel, no issues present. Host PC is powerful enough to deal with Whonix. Surprisingly Gateway works without any issue!
Hope you would help and short this out soon.Thank you again for all of your hard work.
Update: July 31, 2018
Found out that the moment you maximize the Workstation window by dragging VBox window corners, it hangs.
Resize the window not by dragging the Virtual Box corners but by using View > Virtual Screen 1 option just after the initial boot. Once resized like this, you can drag window corners as required without any hang. But there is a good chance of getting the Workstation freeze again by this method. So try and use suggested option for now.
What hypervisor are you using? Perhaps its a bug that causes it to underperform. Also from your description its most likely something we can’t help with and would need reporting to upstream projects like Tor Browser to troubleshoot.