Re: Minecraft on Ubuntu (netbook)
You may be able to speed up minecraft by adjusting some options in minecraft to shift it to performance with a shorter view and disabling some effects. Or it may help to increase your RAM to 2 GB. I am not familiar with mate, but according to glmark2, gl graphics in Lubuntu are about 1/3rd faster than Ubuntu running Unity.
I can run minecraft on an Acer W500P tablet PC with AMD C-50 cpu (1 GHz 2 core) 2 GB RAM w/ATI HD 6250 video @ 1280x800 booting Ubuntu or Lubuntu (w/common /home) from SD card. Speed slows down when loading chunks, but can be 15-20 fps at times when chunk loading settles down. I normally only use that computer when out of town.
Although, I have not tried most recent minecraft version, because since just before Steam was released for Linux, I have been playing Team Fortress 2 (and bought Half-Life and Counterstrike when on sale) on my desktop PC.
i5 650 3.2 GHz, 8 GB, nvidia GTX 550 Ti 32" 1080p | i7-4700, 8 GB, Intel HD 4600/nvidia GTX 765M 15.6" 1080p | etc.