Though the Cisco CSS does not provide a direct command to display the CPU usage on a per process basis, this can be achieved via the following commands from within the llama debug utility.

CSS# llama 
CSS(debug)# symbol-table load SPRITZ
CSS(debug)# shell 1 1 spy
CSS(debug)# shell 1 1 spyReport
CSS(debug)# shell 1 1 spyStop
CSS(debug)# symbol-table unload SPRITZ

Additional Resource

A simple solution to High CPU Usage on a Cisco CSS