neither
http://kb.x-cart.com/display/XDD/Speeding+up+your+store#Speedingupyourstore-Step1.EnableCSS,JSaggregationandwidgetcaching nor
http://kb.x-cart.com/display/XDD/Adding+CSS+and+JS+files have any information on why css/js aggregation under Look and Feel > Performance, when enabled, fail to load resources added via URL rather than FILE, from within a Module so I can leverage the awesome
https://cdnjs.com/
I tried to do everything I could to find out the right way to include the links short of saving and serving them locally, and when css/js aggregation is OFF, everything works fine. I would *expect* it would add the external resources as separate LINK and SCRIPT tags when aggregation is on, but that does not appear to be happening.
bug? or did I miss something