Allow Minecraft to use more CPU and memory

This issue was originally reported as a bug in MCPE-157142. However, it was closed as a "feature request or suggestion". So, I hereby make a suggestion.

I often open worlds as "mini-game servers". But the world soon becomes slow and very laggy, despite the small number of entities.

During that lag, the expected result should be extremely high CPU or memory usage.
In reality, however, neither is high; in fact, it does not even reach 30%.

For some reason, this started happening after "RenderDragon" was implemented.

If Minecraft used a little more of the computer's resources, Minecraft would be lighter.