I have two ICX7750 switches that they stacked. they worked on layer 2 and I changed them to Layer 3 operation. after that, commands execute 5 seconds after my typing the commands on the terminal. for example when i type "show run" and hit the enter key on my keyboard, the command execute after 5 second on switch.
I don't have any issues in CPU utilization, RAM Capacity, Switching and routing on 30 access switches that connect to this core switch, STP issues and so on.