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Best solution is no software, or as little code as possible. But that the best software is no software isn't very practical or actionable :)

Example: I only buy basic Logitech B110s wired mice. No vendor software needed to activate mostly useless extra functionality, compatible with every single OS, including OpenBSD which doesn't support Bluetooth. In this case, no (driver) software is the best software.

But that's an example of fast software: how many nanoseconds does it take to run zero instructions?

No code is faster than no code

Faster at doing nothing?

Yes.

If you want to do foo. You don't need framework bar to load baz or call home to qux.

That's all added complexity that isn't inherent to the task.

So we aren't talking about not doing bar. We are talking about not doing all the other things that aren't for the benefit of the user.

Yes. Code doing what you need && nothing else is better than code doing what you need && 10 other things you don't need but have to take a perf/memory/clutter hit for.