In security check, I read applicant profile is screened by CSIS and CBSA, info sharing with G7 (or G5 countries) for any records etc. In the non-express entry, which is PR beggar's pool, this process is very slow, as the saying goes, beggars cannot be choosers like for the express entry processing speed at this stage. For EE folks though, they too are PR beggars (just like us) but their begging happens right outside the door of the lords, so their screening process is super quick. So don't worry as to why its taking long. I think March folks are very close to the end of begging.