Hi,
I run a nested lab and haven't come across these performance issues. The appliance when first started can take a little while to boot up and start all services but we are talking a minute or two rather than long periods of time.
What hosts/hardware is your vCSA running on?
Have you got it configured with the necessary hardware requirements for your deployment?
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Regards,
Ryan
vExpert, VCP5, VCAP5-DCA, MCITP, VCE-CIAE, NPP4
@vRyanH
http://vRyan.co.uk