See my post: https://forums.factorio.com/viewtopic.php?f=49&t=49621&p=289035#p288142
and reduce Atlas Size. Maybe it's some bug with Radeon Drivers...?

I reduced it down from largest possible to 2048 and my issues are gone! Thanks a bunch!

Now I can actually go after the aliens without having to ...

In the last several updates of 0.15.x (I'm sorry, I don't remember which particular one the issue started happening, only that it was after .15.9) I've had an issue where if I go near trees my FPS drops from 60 to single digits, as low as 2, at this speed it is very unresponsive and as much as a tap ...