Problems running LOO on >1 core

Nope, no errors, just disapointing benchmarks. After switching from an i5-6500 to a Ryzen 7 3700X I wanted to see how much more efficient my model run times were going to be; turns out the only benefit was the increased clockspeed of the newer CPU. Benchmarks stopped improving after setting “cores=3”.

After doing some more digging, is this because the cores setting is limited by how many chains you run??