So I upgraded my server hardware and am now getting lots of IOWAIT activity causing it to run slow whenever SABNZBD is active.
Have the same LSI SAS2008 card plugged into a PCIE 3.0 x16 slot on both systems for my array.
Previous Hardware.
Mobo: X9DRi-F
CPU: Dual E5-2643 v2
Memory: 64GB 8500R
New Hardware.
Mobo: x399 Taichi
CPU: Threadripper 1900x
Memory: 32GB DDR4-3200