Here is a quote. Don't know about the reliability of the source or the claim though. The article is dated June 2009.
http://www.sici.org/newsletter/article/what-you-need-to-know-about-applying-for-a-visa-to-canada/
"David Manicom oversees 175 to180 visa staff in the largest and busiest Canadian immigration office in the world, located in New Delhi. The office is currently at the end of its busiest season, when it can receive up to 800 applications for temporary visas every day and up to 400 permanent residency applications every week. During this time, Visa officers process 40 applications a day, making one visa decision every 15 minutes or less."