[doorhammer]

Warning: I only glanced through the code real quickly, so I haven't checked to see if this has unintended side effects to the game logic, or to make sure it's a complete solution.

It looks like there's a variable that controls how quickly the board itself is updated:

  var boardGameUpdateInterval = 10;

And a function deciding how quickly the visual representation gets updated:

  var render = function () {
      setTimeout( function() {          
          requestAnimationFrame(render);
      }, 1000 / 15);

      if (gameTicks % boardGameUpdateInterval == 0) {
          updateBoard();
      }
  
      animateBoard();
  
      gameTicks++;
      renderer.render(scene, camera);
  };
  

They're global variables so it's pretty easy to just drop into the developer console and overwrite them.

I just changed the denominator of the setTimeout to 30 instead of 15, and the boardGameUpdateInterval to 5 instead of 10. Of course, you don't have to change the render speed to get the logic speedup, but I figured I'd do both.

This appears to have sped the simulation speed up by a factor of two.

ymmv