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"Show me a benchmark."

"Show me that this micro optimization is actually needed."

I like both of those and would like to add "Write a working implementation with a sane interface and unit tests first!" :-)

"Make it work, make it right, make it fast".

and then: make it distributed, make it serverless :D

At which point you get to re-do the "make it right, make it fast" steps. :D