The K1000 appliance overhead is very small for SMMP. It is basically a keep-alive type of connection, or a heartbeat. Every 20 seconds we will send 5 bytes for each agent.
There are some other activities that use that connection – specifically Patching and ‘Run-now” scripts. If you have some of these types of items scheduled then it will depend upon the size of the patches or dependencies on the scripts. Scripts and / or Patching can be scheduled to off-peak times or to only have critical operations occur during peak times.