I can confirm this issue. I did a two hour flight yesterday with the Just Flight turbo Arrow and noticed towards the end the GTN was so unresponsive. I was having to push buttons two or three times to respond. It wouldn't zoom in any more and moving the map had a lot of lag. It got so bad I aborted the flightplan and just diverted to the nearest airport. My fps were normal. Here are my specs...
CPU-i7-8700K | 32GB Ram | GTX 1080 Ti | Samsung SSD 860 EVO | Win10 Pro 21H2
CPU-i7-8700K | 32GB Ram | GTX 1080 Ti | Samsung SSD 860 EVO | Win10 Pro 21H2
Scott