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Dynamics CRM 2015 under VMWare is much slower when accessed from host OS than from guest OS

Hi,

I have Dynamics CRM 2015 running in a sandbox VM under VMWare Workstation. I can access this CRM instance in two different ways:

By running a browser on my workstation (host OS), and browsing to http://crm.sandbox.local/
By opening the guest VM (in Remote Desktop or in VMWare directly), and browsing to http://localhost/

When I'm browsing CRM from the guest OS, it's really fast and responsive, so I know CRM is running OK on the box. The problem is when I'm browsing it from the host OS - it's 5-10x slower to load pages, navigate, populate controls and subgrids, and I honestly can't work out why. The obvious solution would be a problem with the VMWare virtual network, but I've checked that - and even benchmarked a different application that's hosted under IIS - and can't see any problems.

The only other thing I thought it might be is authentication - the CRM VM is running a local Active Directory domain, so when I'm browsing it via localhost it's using native NTLM authentication, whereas from the host OS I have to explicitly sign in with the sandbox username/password - could that be introducing a delay into every HTTP request? Has anyone experienced similar problems?

Thanks!

Dylan

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