We attempted a stress load on our server and found users unable to join. The RDS would blackscreen and drop. It happened after 8 users had joined. The performance also was dropping as each connection stacked and after we saw the Event Viewer had 450+ Critical Error 1000 with dwm.exe dwmcore.dll crashing.
HP Dl380 Gen9
2x Xeon E5-2697 v3
192GB Ram
Nvidia Quadro M6000 24GB (Current Driver) RemoteFX enabled
Windows Server 2016
Bare-Metal RD Terminal Sessions
We currently have a similar environment with 2012R2 without a problem,