take a good look at the code I posted. using drawAndFlushImage with a buffered image is currently the fastest method available to do overlays.
you shouldn't use any other method really. you draw to the buffered image, then flush it to the framebuffer.
it is the same with text, just clear the buffered image before changing its contents the way Andrew Davison does in the link I posted. don't try to be too creative in this matter, it wll only cost you time.
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