What is multitheaded in mcserver ?

[FakeTruth]

Threads per client:

1. Data receiving, packet parsing and packet handling
   
2. Packet sending
   

Other threads:

1. Listening for connections
   
2. Tick thread (game logic)
   
3. WebAdmin thread
   

The game logic is done in a single thread, so there's not much load sharing, except for the packet parsing.

There's not much to use SSE for, do you know how to program SSE/SIMD? It's very difficult.