N3048 RSPAN overhead impact

We have a stack of N3048 that we use for our core, and are looking at gaining some insight into the traffic on the network.  all our Server / client traffic resides in a single VLAN.  I started doing some research, and I believe that RSPAN may be the way to go.  I was looking through the documentation for any guidance on overhead performance issues if we enable this, but can't find any information.  Are there any "gotchas" I need to be aware of when setting up RSPAN?  Does this have an impact on the performance of the switch itself?  Thanks in advance!