First I'd try removing DEM in a test pool and see if its quicker, that way you know what component is slowing it down. If its Dem, I suggest moving this to that forum so someone like DEMdev can see it. I'd also look at the gpos provided with 9.9 , there are performance logging you can enable. I can't find the gpo version, but the no ad version is here
also I just found this kb, look at the flexengine log, and see where its slowing down.
Working with VMware Dynamic Environment Manager Logs
Compare logs from a window 10 login attempt and 2019 login attemp and see whats different, you may have something running in windows 10 that you don't in 2019.