I recommend the following thread:
That being said, Seasons will most likely not come before multiplayer.
Has been noted many times, is constantly being improved, is just a process. You can or should not necessarily put too much energy into optimizing things that are not yet final or at least far enough advanced.
LINK: Search results for 'performance' - Last Epoch Forums
The multiplayer mode is highly anticipated by many (including me).
The multiplayer mode comes with version 0.9
We are currently using version 0.8.4f.
About every 2 months a new bigger version comes.
*calculate
Patience is sometimes a virtue.
I rather like it “bugfree”.
Yes, there are at least 3 posts/threads from players about this every week. Simply participate and provide good suggestions for improvement/arguments. EHG listens to us from time to time. 
Bordering hard on point 2, but also partly due to the basic structure of Last Epoch with its underlying “ticks” [time units/intervals of the game’s internal calculations].
[Weren’t those every 0.7 seconds or something like that? [Llama8 and a few others surely have this number more exactly in mind].
BTW.:
How many hours do you have?
→ I’m only at 2085 hours according to Steam.
For a game that is basically only rudimentary [MP is missing hard here] already quite good, I would argue. 