Deployment of OVF templates takes local CPU to 99%

Trying to deploy OVF template to ESXi 5.1, and it take the local machine CPU  with vsphere client  to 99% and the process is very slow.
but OVA files deployed fast and with no issues...
What could be the problem?

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Andrew Hancock (VMware vExpert / EE MVE^2)VMware and Virtualization ConsultantCommented:
Do you just have a single disk?
Vasilax50Author Commented:
Correct, just ovf and one vmdk
Andrew Hancock (VMware vExpert / EE MVE^2)VMware and Virtualization ConsultantCommented:
host datastore ? - single disk ?
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Vasilax50Author Commented:
a bit complicated:
It is a nested ESXi (VM) on another physical ESXi host
The physical ESXi has local RAID, part of it presented to VM ESXi as datastore
Andrew Hancock (VMware vExpert / EE MVE^2)VMware and Virtualization ConsultantCommented:
That is why, performance of the local disk, is the bottleneck.

and also Nested ESXi does not perform well.

Its much better if you deploy and nest soley on SSD.

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Vasilax50Author Commented:
It used to work with no issues until very recently...
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