poor IIS performance on VM

Hi Experts,

we have converted a old server WIN2008 to a VM.
All works but the IIS performance is poor.
The users from outside can connect but very slow and sometimes with interrupts.

Do you have any ideas ?

The VM has 4GB RAM and 8 vCPUs. It is a 32bit system.
We use VMWARE 6.0 with NFS storage on NETAPP.
Before the migration (P2V) the IIS was much more quicker.
Eprs_AdminSystem ArchitectAsked:
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Andrew Hancock (VMware vExpert / EE MVE^2)Connect With a Mentor VMware and Virtualization ConsultantCommented:
*ALWAYS* use sockets!
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Andrew Hancock (VMware vExpert / EE MVE^2)VMware and Virtualization ConsultantCommented:
Comparing physical versus virtual servers, is never a good idea, performance will ALWAYS be better on the physical!

But if it causes performance, or service issues, in your case, this is not good for service.

But 8 vCPU sockets could be excessive ?

How many concurrent users access the server?

Why have you decided on 8 vCPUs ?

also how are these vCPUs provisioned, as sockets or cores ?

see this recent Question on EE, I answered

https://www.experts-exchange.com/questions/28976459/Increase-VM-performance.html

also see my EE Article

HOW TO:  Performance Monitor vSphere 4.x or 5.0
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Eprs_AdminSystem ArchitectAuthor Commented:
I changed back to 4 sockets vCpus
Some old services also took performance of one complete core.

Now is better.

I have to wait until tomorrow, when user connect to it.
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Eprs_AdminConnect With a Mentor System ArchitectAuthor Commented:
OK it is solved now.
Again problems with the nic driver of VMXNET3.

I will change all nic to the E1000 driver !!
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Eprs_AdminSystem ArchitectAuthor Commented:
VMXNET3 driver has problems, when you use webservers and application servers and DB-servers.....
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Andrew Hancock (VMware vExpert / EE MVE^2)VMware and Virtualization ConsultantCommented:
I would qualify that with VMware Support!, before you go crazy and change all over
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