I know for sure that Muskoka after Orillia is catered by Sudbury office, which is very fast because of obvious reasons. Orillia applicants might also get Hamilton or Oakville, So guessing that Barrie might fall in one of those. Toronto, Mississauga and Scarborough offices are jam packed with the sheer volume of applications. If its Sudbury, I will go with it, but the drive in this weather is killing. Keep an eye for the eCAS, they will decide the allocation and then you have the option of rescheduling date and center, which will add more time to your journey. Hope it helps.