Why 5000 rpm

It also leasons the cylinder pressures turning the high rpms so your not hanging rods out the side of the block. If you turn 3000 rpms it takes a greater force to move the piston down than say 5000 rpms. Think of it like riding a 10 speed bicycle up a hill you could put it in a high gear and go 10 mph or put in a lower gear and go the same speed what is easier on your legs the higher gear where it really strains them or move them faster with less resistance in a slower 1.
 
So am I taking this the right way? If you can build a motor that will stay together at 5000Rpms and turn that it is easier on that motor than say a guy running about the same hp at 4,000Rpm or under?
 
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