LL Uses all ram but not swap

[m654321]

What CPU do you have? Looking at Htop in your first post, you seem to have either a dual-core machine (without hyperthreading), or a single-core machine (with hyperthreading): from my experience neither of these types of CPU will be powerful enough to run Minecraft.

We tried Minecraft on the hardware listed below in my signature (except the Pi of course). The only set-up on which it worked satisfactorily, with a decent frame rate, was the Lenovo laptop - this machine has an i3-3110M chip, 4GB RAM (no swap) and an SSD. Though the CPU is a dual-core one, it is hyperthreaded and so it creates two further virtual cores, behaving a bit like a quad-core machine. Even if you upgraded your machine from HDD to SSD, I think the main weakness would still be the CPU: if you have less than an i3 chip, then the machine probably won't run fast enough for Minecraft.

Hope this helps.