That's much more impressive! A whole liter on less than an ounce. Your first stove was way too fast. Slower burning stoves are more efficient to a point. They can be so slow as to never get to a boil, of course. You need to find the right combination for your pot and windscreen setup.

Elevation hasn't seemed to make a difference to me. I used mine at 12,200' last summer. Colder temps can make it harder to light and you must wait longer before putting on the pot.