This fixed ALL of my lag issues, may fix yours and I am currently capable of running the game at 1080P over 60FPS Happily with no more frustrating lag spikes near large bodies of water.

Turn it up to 6, Load the game again, go see if you experience lag and if not, up it some more until you're happy with where you're at. (Not changable in a loaded game) This does not affect what you see in the background for cities and you can still see Zombies etc from a reasonable distance and this may vary per graphics card/CPU setup but turn it down to 5 and then load the game. Stamps and sentiments of choice, Gorgeous Leaves stamp set & Intricate Leaves dies used for my card. Card mat 9.5x 13.85 cm, Thick Basic White used here. Go to options, Video, turn your View Distance down. There's a hint of a good game in 7 Days to Die's mix of zombie attack preparedness and crafting and cooperative stands against zombies, and it has valuable ideas to contribute to the genre. Card base Half an A4 card sheet cut in portrait 10.5 x 29.7 cm, folded in half, Thick Basic White Card used here. Even on the lowest settings, with V-Sync enabled I would drop from over 60FPS to less than 20 when I came across large bodies of water. I was extremely frustrated with searching for a fix for this game because I could honestly NOT find any fixes. The problem is Optimization and the lack thereof in Unity based games with very high View Distance. I've been searching everywhere, people even with upto GTX 1080's and far better CPU's have been experiencing lag and I just remembered one other Unity based game that looked similar and had the same problem Starforge. It is fun however, it had some serious lag issues. Just bought and started playing this game recently.

7 days to die gameplay