Deeper gears less effective ?

I can guarantee one thing, an engine that requires a 5.13 gear is going to take a long time to reach 6000 rpm with a 2.76 gear. BTDT
What I'm trying show is the gain ain't linear in this one aspect, kind of like cr going from 7:1 to 8:1 gives a higher hp % increase than 15:1 to 16:1.