We are a small company and our limited resources are already the main bottleneck in our ability to do things like write exciting new features. Adding extra workloads on top of this, even if we charged for it, would likely make this worse.
If you have a large project and think the engine is not performing well enough, I am happy to profile it and see if there are any obvious hot spots in the engine that can be optimised, which I do from time to time already. However if the project itself is not efficiently designed, that will generally be something we leave to the user.