Nether Lag Fix

There is a lag spike issue in the Nether caused by to many sources of lighting.

(This section was copy pasted from the forum thread.)

What causes the lag: The nether has a lot of light sources: thousands of lava blocks and many fire blocks. Lighting updates for every chunk is checked per-tick, and that causes extreme lag in the nether. How I try to fix that: I keep a list of all chunks whose lighting has been checked, and instead of processing the remaining chunks all at once, process them until 4 milliseconds have elapsed and add them to the list of checked chunks. Once this list is full, it is emptied and the cycle begins again.

This also fixes that weird lag you get sometimes when just exploring in the overworld, classified in the profiler under tickChunk.

If you don't believe me that the nether is laggy in vanilla... start up a server, join it, get creative mode and build yourself a nether portal. Once you enter the portal I guarantee your FPS will drop to an almost unplayable level. (That is, unless you have an absolute beast of a computer)

Also if you've ever run a server with more than 10 people playing on average, I guarantee you there will have been many people per week who have asked "why is the nether so laggy?".

Here is the download you want for compatibility with Tekkit:Tekkit Compatible

The link to the forum thread for the mod is here