All of Canada's stores from what I know are push-all, regardless of volume. We'd do this with 3000+ piece trucks and still get through most of the morning's freight.
...but it is starting to show in the backroom quite a bit.
This is correct. The main reason for this is that Canada stores are running on a Chrome based platform for their "Web-based Applications" while US stores are running on a Java platform. Cross-platform support/development for the applications at launch of the stores wasn't exactly in mind. To be fair, Canada is technically the guinea pig testing the Chrome platform for the eventual move when RFAPP's goes away for US stores and all move to "Web-based."
Don't fret, the Chrome based applications are extremely fast, even faster compared to RFAPP's. In fact, the original developers for RFAPP's are actually the ones who are currently developing the applications for the Canadian stores.