[sn41]

I agree with your basic point - but doesn't "3% faster" usually mean that it runs faster in all cases? So the "97% as slow" does not seem to be clear. Maybe it should be said as the improvement is not significant enough according to some numerical threshold?

[benmanns]

I think it's closer to "I boosted conversion rates on our sign up page by 33%."

Sure, not every visitor signs up still, but some group of people found the new copy compelling enough to sign up - with no new, very expensive feature development.