I would like to add my feedback after the last patch, I am also hit hard by performance issues (whereas before, I had none), since the Jan 6 patch.
To me, it feels like the game is constantly “looking up” something, maybe in a query format and it is not receiving the right info it needs, so it keeps dialing it up, in a constant loop. Something is broken internally, I think. There is an endless ‘stop and load’ action that is happening behind the scenes and it has nothing to do with the activity or the surroundings your character is in.
No effect when fiddling with outside settings like graphic card settings, launch settings to use all cpu cores, set app priority to high, etc… Nothing works or alleviates this problem.
Before the “fix all the bugs” patch, everything ran smooth as silk. No complaints. I guess it’s true what they say, you fix something and you inadvertently break something else. 
It’s persistent, it’s very noticeable, and like others have set the game is almost unplayable due to the sheer volume of hitching or constant world querying that is going on.
By the way, I noticed that despite all the bug fixes, the ‘music still keeps playing even when you turn it off’ bug is still going strong. Few years now. Still no priority for the unstoppable orchestra that just keeps playing no matter what? (Just very quietly - which is still very audible when using headphones.)
Guys, it’s a major issue!
Also, please look at roofing costs. Roof corners now cost 25 stability? I can cover the same area with a square ceiling tile. Was it always 25? I thought all costs were capped at 20. Roofing is now more expensive than putting in another level of floor tiles. Shouldn’t it be cheaper, to encourage people to actually use roofing because it ends additional layering, as opposed to making endless towers?
(Wedge pieces are still too expensive. When building round towers, the inverted wedge piece will take you from a wall with 100 to a wall with 60 durability even though you have only moved one tile space inward, not two.
Because my roofing goes like this: Wall 100 > wedge (80), wedge (80), inverted wedge (60). You cannot connect to the wedge pieces, you connect instead to the inverted wedge because it has the only flat connection, going up. Bam, 40 durability drop just because you’re not using squares. That’s not right.
If you use squares, you never break the 100 > 80 > 60 > 40 > 20 (end of connection) pattern. AKA, you never skip stability tiers.
Please add stability costs to server settings? You can do whatever you want for pvp servers and official servers but let builders set their own wedge costs to what they think is fair. (For me, I really believe wedge pieces should cost half the durability, so I would set their cost to 10 there, but there is no option for me to so.)
I can, however, set the timer to which food decays. Give me something useful. Let me set stability values in server settings or let me disable the feature all together. There was a time, believe it or not, when CE didn’t have this feature and nobody was complaining. Why is it so hard to mod or turn off? Hardcoded outside of server settings?)
You can adjust the maelstrom, but you can’t adjust anything about the structural integrity system. I think that’s both an oversight from you guys (devs) and a limitation to the players.