When dealing with CPU issues, we need to correlate information from different sources. Do you see high CPU utilization when running "show chassis routing-engine"? Do you see any weird logs when running "show log messages"?
The processes showing CPU utilization are:
Thesfidprocess is thesoftware forwarding infrastructure daemon. This process handles all traffic that the switch cannot handle in hardware alone. Common examples of such traffic are:
High CPU usage for thesfidprocess might indicate a problem, and certainly could impact performance when you have legitimate traffic that ought to be software switched. I would suggest checking what traffic causes this problem in the first place.
This process has to do with SNMP polling via the kernel. some SNMP MIB data are maintained by the kernel or Packet Forwarding Engine. For such data to be available for the network management system, the kernel has to provide the required information to the SNMP subagent in mib2d.