There is possible that my knowledge is wrong, so please don’t trust me at all.
1.7 Minecraft doesn’t support multithread, so I guess GT6 doesn’t support.
(Above 1.8 MC can support 4 core.)
I heard Optifine(client-side) and bukkit(thermos) server plugin called “MinetickMod” can support multithread.
Optifine can support 4 core but it sometimes causes several problems you know.
Here is my idea that can reduce lag.
- Upgrade your PC.
- Separete client and server by two PCs.
- Install reducing lag mods such as BetterFps, Optifine, Fastcraft and so on.
- Write currect JVM arguments. Add more RAM.
- Change Nvida GPU setting if it seems Java doesn’t use GPU.
- Close other applications.
- Do CPU overclock.
- Use SSD.