3- Search for “arch linux improving performance”. There should be a guide in the arch linux wiki regarding some system-wide tweaks via sysctl.conf – follow it.
4- Also search for “how to enable zram arch linux”. Basically, it clogs your cpu a bit to squeeze a bit more of ram out of your system. Follow it as well.
Don’t expect any “miracles” out of this… but it should make things more doable/tolerable.
If everything goes wrong, then you can always resort to either geforcenow or xcloud. Or both.