Over the next week or two, I will be updating system kernels to 5.6 kernels.  This provides some additional performance enhancements verses 5.5.  It allows server-to-server copies in NFS and it allows peripheral-to-peripheral DMA on the hardware side which should improve the efficiencies of things like disk to disk copies by not requiring the CPU to intervene other than to setup the DMA transfer.  On my workstation it has also been somewhat more stable although I have not seen stability issues with 5.5 on the servers.