we decided to change our address to Missisauga and requested the file to be moved there as Scarbourough has huge back log, let see how it works now
I was looking for some more information about IRCC policies, and came across their policy on address changes. I remembered this post and thought that some of the bits of information in it may be of interest.
A few items from IRCC policy on address changes (at
https://www.canada.ca/en/immigration-refugees-citizenship/corporate/publications-manuals/operational-bulletins-manuals/canadian-citizenship/admininistration/general-file-processing/sending-applications-changes-address.html):
Transfers should not occur within the Greater Toronto Area, except in exceptional cases.
and from the same document:
There may be instances where an officer believes that a change of address is not legitimate. Clients may change their address as a result of a perceived leniency in decision-making or quicker processing times at another office. If this is the case, the officer should request from the client more information on the change of address. If the officer is still not satisfied with the additional information, or if the client does not supply the officer with it, the files remain in the original office and the client is notified.
and also:
The local office will transfer the file to the new office within six weeks of notification of change of address. (...) If a client inquires about a file transfer before the six week period, the Call Centre will advise the client to call back after the six week period for an update, if necessary.
So, there's a chance this move won't achieve anything. Worst case it may cause either an officer to try and validate that the move is legitimate (delay to send a query and await the response) or the move may be processed but incur a six week delay. And the receiving office can have its own policies on how to integrate the file into their workload, so that may also trigger a delay (or the opposite, of course, but that is not information that is publicly available).