sorry about the vague answer, just realized I missed the first part of your question also the typos , I was holding a baby who wants to play with my phone while I was typing on it. usually if you are an inland applicant , your application will be processed in CPC Ottawa , it might be transferred around a bit but the primary office will be Ottawa .
but if you are an outland applicant, your primary office will be a visa center in your country . and it usually takes longer than an inland application because they are more careful with your background checks .I might be wrong but that's what I have learnt .