ranietz began
discussion on discord ~6 months ago re: reading a 760k word file, line by line, which took many (many) minutes on android.
in the end, loading 768k words as a .json array file, instead, took a mere 1.6 seconds. see the
array (2.0) guide (near the bottom) re: saving as .json
otherwise, the thread title (same with the old thread you referenced) cite the actual parsing as being the slowdown so i'm a little confused about your inquiry; especially where it includes "where to put the text file"?) so, if rich and i are off the mark, let us know?