Lo-Fi Games

And if you just update the render version to the current one so that the render has support for multithreading?

Then the question arises:
Why port old content to the new OGRE engine when you can adapt the new OGRE engine to see the old content?

Please enable multithreading support for processors. The game chokes on one thread of the first processor core. Moreover, the game engines support multithreading.