Yeah, Factorio is multithreaded, but in practice it usually only runs a few ways in parallel. Instead its performance is determined in large part by the memory

Yeah, Factorio is multithreaded, but in practice it usually only runs a few ways in parallel. Instead its performance is determined in large part by the memory subsystem, which is why the X3D processors do so well. It's probably also part of the M1's great performance: with a large cache and stacked DRAM, it has very competitive bandwidth and latency.