1. The whole system is dedicated to running my one program, 2. I want to use multi threading to share large amounts of state between workers because that's appropriate to my specific use case, and 3. A 2-8x speedup without having to re-write parts of the code in another language would be fan-freaking-tastic.

In other worse, I know what I'm doing, I've been doing this since the 90s, and I can imagine this improvement unlocking a whole lot of use cases that've been previously unviable.