In the past year, a few applicants sent PCC voluntraily in the later stages of processing and as a result CHC-Islamabad did another background check on the applicant. They thought it would speed up their processing time as the PCC would show no records of criminal activity etc etc. But instead CHC- Islamabad ran background check again through the agency and it took 45-90 days or in some cases 120 days as well for the results to come back. So this is how their processing time increased. They found out when they ordered CAIPS wondering why it was taking them so long for PPR and in some cases Visa with the passport.
Also some people sent supporting documents voluntraily after the initial review was done, thinking that it would speed up the process. As a result, their files were put back in the reivew queue for assessment although their relationship was considered legit and satisfactory at the time of initial review. When CHC-Islamabad would require something from you, they will send you a request and ask for it. I hope people would be smart and learn from others experience and mistakes and not repeat these mistakes.