The tether network is greatly improved. I even get faster load times on my save. I still get objects falling through terrain if I alter the terrain nodes they touch (when flattening, this is a big deal, I've watched my entire base fall before). Also, I consistently crash no matter what I'm doing at about 60-90 minutes of play time. I'm saving often so that's not a huge issue for me, but still. I have noticed with the collision problem, it doesn't seem to do it as quickly, now I have more time to grab an item before it sinks.
As a possible help. I loaded my game on another computer with a very new gpu, all the places where I had collision issues and things falling, as well as other places where I've altered terrain had single terrain nodes scattered so it looks like walking through a mine fields of diamonds. When taking the save back to older computer (saving on the newer one first) those nodes remain and collision seems to be better???