Is "server performance mode" enabled or not?

When experiencing some MAJOR file sharing slowdowns in a new macOS High Sierra machine running Server.app I came across this page from Apple showing how to enable "performance mode for macOS Server". https://support.apple.com/en-us/HT202528 Some online resources make reference to the "old" procedure before SIP prevented that from working, and provided instructions on how to turn off SIP and then use "serverinfo" to enable perfmode, and then turn off SIP. References at https://apple.stackexchange.com/questions/265620/no-boot-args-in-nvram and https://apple.stackexchange.com/questions/264958/what-does-serverperfmode-1-actually-do-on-macos gave me some more information, but I cannot find info about checking the perfmode status in High Sierra. I have set the NVRAM variable like Apple says, and checking it returns the proper result of "boot-args serverperfmode=1" and I restarted a few times, but "serverinfo --perfmode" still returns the result of "Server performance mode is NOT enabled." When set via the NVRAM, should "serverinfo --perfmode" tell me that performance mode is enabled? If not, how can I tell if it has been enabled? The NVRAM variable essentially says "turn it on when you boot", but it does not tell me "it got turned on when I booted".