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Black Screen Delay at Login XenDesktop 7.15



I just upgraded my Citrix XenApp hosts from Windows 2008 to 2016.  Everything seems to be working fine but there is a login delay where the user only can see a black screen for 10-15 seconds before the desktop fully loads. Is this normal for Windows 2016?  When I was running 2008 I was seeing 15 second logins and now I am near 40 seconds. I am hoping to improve this if possible. 


XenDesktop 7.15.4 LTSR

PVS 7.15 Cache on Device RAM Overflow

XenApp Hosts 4 CPU and 16GB RAM


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Did you find a solution for this?
We have the same problem with our Server 2016 VDAs.
It is worst after a reboot. Then the black screen appears for the first user for about 60 seconds before you see anything.
For all other connections it takes about 10 seconds.


Edit: It was TrendMicro.

Edited by Maik Ludwig
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