From the comments...
My favourite comes from an N64 game. Rendering all the text in the debug menu was slowing the game to a crawl, making it hard to debug other issues. The number of characters being rendered each frame had to be reduced.
What could be more obvious? Only render every second letter! But alternate, so that on even numbered frames, you render even-numbered letters, and on odd-numbered frames, you render odd-numbered letters!
This leaves you a flickery, but fast and usable, debug menu.
GroovyMAME support forum on BYOAC
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