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The point of upvaluing global functions called frequently is to reduce the amount of time it takes to get a return from those functions. A local is much faster to access than a global is.
Your script calls your AlkaT_SpORCo_update function and has to wait for it to finish before moving on to the next line in the script (AlkaT_timeSinceLastUpdate = 0). The faster it is completed, the faster it can move on. Your AlkaT_SpORCo_update function has to wait on the global functions that it calls before moving on in its code. And so on. Lua is single-threaded.
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"You'd be surprised how many people violate this simple principle every day of their lives and try to fit square pegs into round holes, ignoring the clear reality that Things Are As They Are." -Benjamin Hoff, The Tao of Pooh
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