Slow Accessing data from shared network drive in hyper-v VM

I recently moved a bunch of company data that everyone in the company accesses via mapped network drive to a 2012 VM running on a 2012 R2 host server. HP proliant 385p gen 8.
The users that try to open PDF or Word docs form the network drive get very slow performance. The performance get even worse the futher they drill down into the subfolders. Sometime 10 to 20 seconds to open a doc and even longer to save a doc.
I copied some of these large folders with many subfolders from inside the VM server outside to the Host server and everything is super fast again? The VM has the latest integrated services?

This all should run super fast inside a VM. I have a similar setup on a different host server sharing a drive from server 2012 host running a 2008 VM and there are no issues with speed.
I can't for the life of me figure out why. Anyone run into this issue?
WIZU2Asked:
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WIZU2Connect With a Mentor Author Commented:
The issue was that the host NIC needed a driver update. Then whole issue went away.
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bbaoIT ConsultantCommented:
at first, check general network performance.

did you ping the shared VM from a typical client computer which has been observed slow connection to the sever VM?
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Andrew Hancock (VMware vExpert / EE MVE^2)VMware and Virtualization ConsultantCommented:
The VM is not running on a snapshot or checkpointed VM ?

Hyper-V Snapshots FAQ
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WIZU2Author Commented:
It was the answer
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