Long load times for generated chunks

[NothingClever]

I recently generated a map and found that Minecraft would take minutes to render the chunks. I eventually discovered that Minecraft stores the integers in the HeightMap structure of a chunk as 0x??00_0000 while TMCMG stores it as 0x??FF_FFFF (using Java 8 update 131). Changing the function setLightHeight in ChunkData from:

lightHeightData[lightHeightIndex(x,z)] = (byte)(height);

to

lightHeightData[lightHeightIndex(x,z)] = (byte)(height) & 0x000000ff;

fixed the issue on my system.