Is there any modified Blender Game Engine that can run at more than single core?

Is there any modified Blender Game Engine with openGL 2.1 or below that can run a game at more than single thread or more than single core?

I need it for my game project. Here’s my game https://youtu.be/Hq1pvNGHc7Y . When I tried to spawn 6 player objects, it’s getting lag. Logic and rasterizer is rising while my CPU usage won’t reach beyond 25%.

The game made in Blender 2.79
My hardware spec is:

  • CPU and GPU : Intel i3 370m 2.4GHz 4 threads 2 cores with Intel HD Graphic.
  • RAM : 8GB 1.3GHz

Note : Changing my current Hardware is not a solution.