I am seeing high latency on a 1531P in routed/Layer 3 mode and for the sanity - cannot pin point where the issue lays.
We have other vendor units out there like Cisco and 24 port Adtran's but they seem to not have this issue.
This particular switch is actually running the latest firmware: R11.8.0, this has happen on other Adtran 1531P switches, too so this is not isolated. They seem to work fine when in non routed/vlan'd mode.
Anything that can be shed on the issue would be greatly appreciated.
I believe this error was resolved by applying ip route-cache express