I run a high intensive fort wars server that on average uses over 300MB of RAM and usually has around 20-30 people, all using vehicles like F/A-18's and tanks - would the higher performance linux server help with the ghosting issue I get?
Assuming you're still using the same Windows VPS host as before now, you'll definitely see a very significant increase in performance on our servers. I'll be honest and say it's not guaranteed to fix your ghosting issue, since those are not always the fault of the server being too slow. Sometimes it's because the amount of ghost updates the server is producing simply exceeds what Blockland's networking engine can actually handle, this bottleneck means that no difference in server is going to make this issue any different.
On the other hand, it will help in the rather common situations like intensive vehicle physics calculations, which happen a lot on servers that focus on vehicles. (Seriously, I've seen some home-hosted servers hang for over a minute when a particular vehicle collision got too messy)