The initial authentication will be fine sub 2s. The next thing to consider is roaming between APs.  You'll want to make sure you have fast roaming enabled (802.11r), so a full re-auth is not required each time a client moves between APs.  Otherwise if auth takes 2s, the user will stop passing traffic for 2s each time they roam.   This might also be of interest: https://documentation.meraki.com/MR/Encryption_and_Authentication/Meraki_Local_Authentication_-_MR_802.1X  ... View more