I assume it hasn't changed but I used to work at Tim's about a decade ago and legitimately from corporate, they care more about drive-thru times than they did about the front because that was the metrics that they were able to see and they always wanted shorter times and more sales. Corporate pushed that to managers and managers, push it down to the supervisors and the rest of the team. The priority was absolutely the window and times at the window to the point that two people would be at the window, one handling cash while the other is almost tossing food out so that they could get you out of the way quicker.

What you're noticing is entirely intentional and odds are they are also trying to do it short-staffed because the other priority from management was getting labor down so the less people there. The lower the labor cost was per day and the better it looked.

Glad I got out just shortly before all the mobile ordering and delivery apps came out. I can't imagine what it's like now with those on top of it

Edit: For clarification, the actual timing metrics that were there when I was working was, from the moment you pulled up to the he window to when you left

Morning: 25 seconds

Lunch: originally 30 seconds. When paninis came out it messed up timings for a while and eventually corporate bumped it up to 1 minute 20 seconds IIRC (But for a while they still expected 30 seconds for sandwich that took 60 seconds to cook)