Compound every ALGO of staking rewards.
Back then, Algorand participation rewards were based on your on-chain balance — so to actually compound them, you had to periodically “touch” your account by sending a 0-ALGO transaction to yourself, folding accrued rewards into your balance so the next round paid out on a bigger number. AlgoOptimizer tracked and automated those compounding nudges. When Algorand ended participation rewards on May 14, 2022, the trick — and the tool — gracefully retired. This page is a small monument to it, dressed in the blue-and-grey of the old SGI desktops.