What to do:
Java plugin (.\Projects\Yomi\AppY\System Tools\Sun Java JRE.script
-increase FBWF from 512 to 768 or 1024 MB (as long as a real minecraft.script doesn't exist and one uses copy-to-method)
-DirectX11 enabled, graphics driver recommended, working sound
(-nice, if PEnetworkmanager loads WLAN-profile at startup... and one gets desktop with already activated internet connection)
-Copy your folder C:\Users\[yourusername]\AppData\Roaming\.minecraft into X:\Users\Default\AppData\Roaming\ (~155 MB)
-Copy folder C:\Programs\Minecraft to X:\Program Files\ (~150 MB)
-Start X:\Program Files\Minecraft\MinecraftLauncher.exe; fps:15-50; also fullscreen mode.