Exchange 2016 CAS Server Isn't in the Active Directory

Hi All, hope someone out there can help me. I have an Exchange 2016 Server with 40 PCs connected, mix of Windows 7 and 10 all using Office 2016. We are experiencing some performance issues so I am checking the HP Proliant Server to see if there is anything I can do to speed things up. I've noticed I should disable Hyperthreading so that will be turned off soon but the other thing is after I have run BPA it states that The Exchange Client Access Server isn't in the Active Directory, Make sure your Client Access Server is in the Active Directory , even though It's running on the Domain Controller. Is the AD missing a record. Outlook takes over 3 mins to connect on a 1 year old PC the first time it's run.

Thanks
PeterNairnAsked:
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Seth SimmonsSr. Systems AdministratorCommented:
...even though It's running on the Domain Controller.

please build another CAS server and get it off the domain controller...start there

Installing Exchange on a domain controller is not recommended
https://technet.microsoft.com/en-us/library/ms.exch.setupreadiness.warninginstallexchangerolesondomaincontroller(v=exchg.160).aspx

aside from that, check your autodiscover configuration...it will definitely cause issues with clients trying to connect if something isn't configured properly

Autodiscover service
https://technet.microsoft.com/en-us/library/bb124251(v=exchg.160).aspx
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Hasin Ahmed ChoudharyExchange AdministratorCommented:
Is that warning from BPA. Ideally, exchange 2016 doesn't have separate CAS server role. I just have Client Access Service within mailbox server role.

Check this few links if those help:
http://blog.ollischer.com/exchange-2016-poor-outlook-2016-performance-troubleshooting
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Hasin Ahmed ChoudharyExchange AdministratorCommented:
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