As Per below from CIC website. NDVO may not be processing all parts of the applications. i predict that some applicants processed faster might be result of applications divided across various VO across the world but again its just my prediction.
Processing of permanent resident applications, including those for economic class, family class and refugees. Note that prior to December 31, 2015, processing times for many of our services were displayed by visa office. This was useful when applications for permanent or temporary residence were always processed by the nearest visa office. However, we now have the ability to move applications around our global network to ensure they are processed as efficiently as possible. This means applications may not be processed at the office closest to where the applicant lives. As a result, only overall processing information is now being reported.