Rule of thumb : the office processing the application of every single person asking a variant of this question is indeed the slowest.
A better question is : what do you think makes YOUR application slower? Are you stuck in background check (which has little to do with the processing office)? Is the physical presence difficult to verify? That would be more helpful to you than a generic "average processing time per office as seen in the excel sheet".
Also : Scarborough and Mississauga.