[Davidsilva]

Should the new parameter be added *after* 'quiet' on the same line, or on a new line below it? And boy howdy, isn't nano fun to figure out for a command line noobie? :-) 

  
same line, you're adding it to the existing list of kernel parameters. so your line will look like:
APPEND boot=UUID=<short string> disk=UUID=<long string> quiet pcie_aspm.policy=performance
then save/exit: CTRL+o, CTRL+x 

 How do I apply this to my Chromebox, think this is the fix I need for the buffering