Modern high end road bikes are weight about 15 to 17lbs. However, I do not see recumbent bikes are weighted even close to high end road bikes.
The long drive chain, the heavy chair and the long and oversized main tube are all increasing weight. I am starting to think that lighten a recumbent bike is nearly impossible.
Most people thought recumbent bike is faster since it is more aerodynamic but I think that it is already old school thought.
Moreover, riding a recumbent bike is not as efficient as a road bike because a rider need to lift up both leg, plus he cannot use his body weight to help pedalling when going uphill.