No idea why many cases in ON are so fast. Many people seems to see DM within 2-7 days after exam.
In our case, no fingerprints were requested. No missing documents. Passed the exam without problem. Shall be a normal case.
The oath invitation letter were issued 4~4.5 months after the exam (Called CIC after ~3 months and said it's just normal, the whole process are expected to be done within 12 months). The oath is scheduled about 6 weeks after the oath invitation letter issuing date.
My friend did it one year earlier than us, in Vancouver office as well, slightly faster though. Oath letter issued ~ 3 month after the exam.