Would there be a significant performance increase for such a port?
Running native is always faster than running through wine. I do believe it would be significant.
Someone has also found a way to make dedicated servers work, t requires some work with the terminal but its easy.
Linux can actually become an alternative OS, when im an adult and I buy a new PC, if its for gaming but just a home or server PC ill just put Linux on it to save $100.Blockland really does work perfect with Wine, although I tried it yesterday with Ubuntu 12.04 and a version of wine (it might've been old) but Blockland did not start up, I think it it was because I didn't have my sound drives an it didn't come up, doesn't make much sense but I think that's why.Someone has also found a way to make dedicated servers work, t requires some work with the terminal but its easy.
I would recommend you to try linux in a virtual machine, it is a simple way to test it out without any danger of messing around with your actual machine. A good way to do this would be to use Oracle Virtualbox (google it).