Not sure if it's on my pc end or not, but around turn 110 into Lucy Opendev with ~60% of the map explored, I started experiencing some massive gameplay lag. The first indication is the sound starts getting choppy, and within a turn or 2, the game will seize up briefly (about 10-20 seconds) and will resume for about the same amount of time, repeating this cycle until I reboot the game. While saving, exiting, and reopening the game resolves this, it crops back up every so often.  I'm running Nvidia GeForce GTX 1070 Ti with an Intel i7-8700K, and it's been something that handles nearly everything I throw at it (Destiny 2, Guild Wars 2, PSO2, Factorio, Satisfactory, Space Engineers, Risk of Rain 1 & 2). It could be an issue maybe with changing between units at different ends of the world possibly, as I was writing this up during the 2nd restart of the game and it happened shortly after that.