Hi,
I've been having some problems with getPendingBlockUpdates() from the WorldServer class causing excessive lag on a modded Minecraft server. Profiling it simply says that the method itself is the source of lag, no specific mod is named.
I was considering disabling the saving of "TileTicks" to world NBT files entirely (http://minecraft.gamepedia.com/Chunk_format#Tile_tick_format).
Does anyone know if this would cause serious problems for tile entities, other than redstone being slightly out of sync on a modded server?