Wow, thanks for reporting this. We're currently investigating and trying to understand the general issues everyone's been feeling around inconsistency in game feel from game to game.
Alt-tab as a trigger is something that jogs a few gears in our brains in potential causes, including a couple that we were already going to investigate, but helps in attributing a direct cause, and is a potential explanation for how netcode feel can just simply vary game to game. We're still going to investigate other potential causes, but this has me a bit more hopeful in that we're going to be able to find the crux of the issue and address it more quickly, now that we have a way to potentially trigger it.
We're getting our QA to get some reps on this and help us understand what's going on with netcode when someone alt tabs, and were already getting diagnostics for the parts of the system we think are going wrong. We don't have anything concrete to share yet, but we are definitely taking a close look - after all, this is one of the most important things for the game.