First off, I am using a really old macbook pro from 2012 with a core i5 2nd generation which is really old, but I got some pleasant results. (This isn't my main PC; it's just an old laptop.) What I noticed is that when I went to activity monitor (aka task manager on windows), Minecraft isn't using the entire cpu. For some reason it's using less than 30% which is really weird, and that's why I sometimes get lag spikes. Is there a reason for this? If there is, how do I fix it? I want it to use as much as it needs. Even after maxing out the render distance, it still isn't using much at all.
Will something like sodium work?