netflow on ASA 5500 series

I have never configured netflow on the ASA and after my research, I see that you can configure netflow or NSEL. Are those the same thing? Is there any performance issue when implementing Netflow on the ASA? Any tips? Thanks
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Joey YungConnect With a Mentor Senior Network EngineerCommented:
The following link provided a good reference of NSEL:

BTW, I never try to enable netflow which is below ASA552x model.
Michael OrtegaSales & Systems EngineerCommented:
Here's a good sample config. I'm assuming you're sending the Flow data to a host outside your organization and that the name of your outside interface is "outside".

snmp-server host outside community SNMPNAME version 2c
snmp-server location LOCATION-NAME
snmp-server enable traps all
flow-export destination outside 2055
flow-export template timeout-rate 1
flow-export delay flow-create 60
access-list netflow-export extended permit ip any any
class-map netflow-export-class
 match access-list netflow-export
policy-map global_policy
 class inspection_default
   inspect snmp
 class netflow-export-class
  flow-export event-type all destination
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