Is there a MOD for it? Or a line in this startup thing? Would like to use more cores because I have a mod 30 fps but only in the normal case without mod 80.
No, you would have to program Minecraft for that
I believe (at least after the utilization of the cores of my CPU) that MC meanwhile uses all.
No, unfortunately, java can't do that
Java is, as far as I know, very good for many nuclei. MC was / is programmed so modestly.
Java is also very poorly programmed but most of the time it's just because Minecraft hardly needs any power