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Here is a more efficient waterfall operation. It only requires a single call to tft.BTE_move. It's similar to the typical DMA ping/pong double buffering. The key is we only need one copy of the waterfall, either on layer 1 or 2 and can switch back and forth between the layers with each draw. This cuts 10ms from the time required to update the display.
*** Sorry for the extraneous whitespace edits. My editor doesn't like whitespace at the end of lines.