Hello Chad.
There are several possible reason why your switch/vlan could be having high latency issues or slow performance.
- Duplex/Speed mismatch.
- Output drops.
- Interface erros.
- Spanning-tree loops.
- High CPU.
Check you both uplinks and access port for possible duplex/Speed mismatch.
- Most of the times, the show log is enough to realize there are speed and duplex problems. You can also run the command show interface to check for specific interfaces.
Check for both uplinks and access ports for possible output drops / input errors
- Output drops are equal to packet loss, when you experience packet loss you will also notice that connectivity problems, lots of retransmissions, acknowledgents, resets .... etc (in wireshark) Check for the output of the command Show interface counters errors.
Check for spanning-tree loops.
- The best way is to enable mac-address notification mac-move from the global configuration. Then take at look at the show log for possible mac-flapping, host learning messages.
Check CPU utilization.
- Commands like show process cpu sorted | ex 0.00 helps in this case.
Regards.
Wilson B.