I would say a tentative "yes" that performance has improved but its still not on par with Windows. I'm going to do a bit of proper testing to confirm. Chunk loading seems a bit better though.
Edit: After some tests Windows version still uses much much less CPU.
Thank you for your reply. These random crashes are always impossible to track down but I reported anyway in the hope that someone might have a solution or at least people can see what I did to solve.
Seems to be fixed in the latest version. Fingers crossed