Dark Forest's key mechanic is its cryptographic fog of war. When you first join the game, you have no information on where other players are located.
Players must compute hashes in order to uncover points of interest in the universe, such as the locations of planets and other players. These hashes are saved to your browser's local storage, and are considered secret data.
You can set your webclient to use additional cores next to the play pause mining button. The performance of your miner will plateau if you try to set the number of cores to be greater than your computer's actual number of cores.