What is the difference between Blocking factor and "Group runs into random blocks" in Custom Design?
When building a design in the Custom Designer, there is an option to add a factor of "Blocking" type. Alternatively, there is also a check-box to "Group runs into random blocks of size...". What is the difference between these options? It seems the "Group runs" option is much slower than the "Blocking" factor and I'm not sure why that is, but it suggests there is a difference as to when one should...