Yes, but it's pretty new, so it may well still be under development. I'm not, in any case, specifically blaming APFS. At the moment there are a lot of people with performance issues. The next step is to identify what the actual cause of these is.
Well, I can say that there are glitches using the Air 2. That's not to say the device is completely compromised, but there's definitely something afoot. For example, there is significant judder in the Reddit app on the Air 2 that was not occurring when scrolling on iOS 10.3.3. In fact, the judder is at about the same level as on the 5S, a significantly less powerful device. It rather looks as though the extra power of the Air 2 is not overcoming or even reducing the problem. If the h/w makes no difference, suspicion naturally falls on the software.