Quoting the CIC website:
"Please note: Due to an extraordinary circumstance related to our electronic scanning system, PR card processing times have increased significantly. We are working quickly to fix this problem and apologize for any inconvenience it causes. Once the technical issues have been resolved, we will make every effort to clear the backlog of files and reduce processing times."
Ref: http://www.cic.gc.ca/English/information/times/canada/process-in.asp#n4
I really hope processing time reduces in the nearest future :-[