High CPU Usage with Async Chunks enabled

How to reproduce:

• Enable Async Chunks
• Load an Vanilla World
• /speed 10 while flying (Essentials)
• Load chunks

CPU Usage reaches 40-50% while loading chunks
(Tested on Titanium and my Spigot with the async chunk patch to test)

[P3ridot]

Decorating chunks are unfortunately pretty expensive and at this point I have no idea how to optimize it...

Decorating chunks are unfortunately pretty expensive and at this point I have no idea how to optimize it...
ChunkProviderGenerate would be a good place to work i guess