I have not noted any significant performance degradation on a pix using vlan ieee 802.1q tagging. The org. that I work for uses a pix 515 as a firewall interface to the vpn gateways and that pix is configured to use vlan tagging.
However I would not recommend that you allow the interface to use auto negotiation. I have seen issues with that, with or without vlan tagging, so I would rather see you code interface ethernet1 100full, or 10full instead of auto.
Login to the FXOS chassis manager.
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We have configured the outside and inside Interface with official ipv6 adresses, set a default route on outside Interface to our router, we also have definied a rule , which also gets hits, to permit tcp from inside Interface to any6.
In Syslog I also se...