Low memory when other chunks start loading. There is a glitch when anyone first spawns. 1 hour after, all chunks are loaded, but memory is really low. It only takes 1 second to have 30-130 fps.

It is unable to do well when all chunks are loaded. When I first start playing only 16 chunks loaded. When all other chunks loaded, it doesn't take much for the fps to go down to 0-8 fps. It won't take much for it to stop and go. However, it take 100 milliseconds to add 1% used memory. The used memory goes no less than 90% once all chunks start loading. Before all chunks start loading, It goes 15-130 fps.