Board Thread:Questions and Answers/@comment-86.135.248.25-20140513144321/@comment-94.195.57.191-20140517090419

The problem with that is that the nether generates an awful lot of other things as well, and so can be quite laggy. I recommend delving into mystcraft if you can; its rather difficult to find the pages but once you've done that the possibilities are endless. The page order for an infinite lava world is:

Single Biome, Ocean Biome, Lava, Standard/Flat Terrain, No weather [or any weather page], Zero Length (*optional*), [Sun Page], [Moon Page], [Stars Page]

You spawn on a stone platform and have a safe, mob free, infinite lava source :)