Performance can't be outside spec. Performance is part of the spec. Maybe it says "don't care" but it's gotta be in the spec and if it says "don't care" it be

Performance can't be outside spec. Performance is part of the spec. Maybe it says "don't care" but it's gotta be in the spec and if it says "don't care" it better be you really don't care. If you have performance targets you have to design towards them - don't meet all the other goals and only then start thinking about performance.