@ abddayo: Several reasons I'm guessing:
- Easy cases are processed faster than complicated ones. The time mentioned on the CIC website is the time required to complete 80% of the applications, which means it includes a lot of non-straight forward cases. This affects the time required.
- People on this forum are more likely to be prepared well, giving lots of evidence and ensuring their application is complete. This means less documents that need to be sent again, and other delays.
- A lot of easier cases are processed at either Ottawa or Mississauga nowadays, and those processing centres are way faster than most visa offices.