The insulation allows for a faster "bloom" as it wicks the alcohol to the holes and thus doesn't need to wait for pressure to build up. Credit "Zelph" for this design in his line of stoves. This is more pronounced as the temps drop. A wick based stove like the fancee feest which doesn't rely on any "jet holes" basically lights like a candle even at negative F temps. There isn't any speed advantage in boil times nor in efficiency except for there isn't any wasted fuel to prime the stove (ala whitebox) or wasted time in waiting for the stove to gloom. I am not a fan of tinny's stoves as they are over-machined and expensive. With an alcohol system, simple is much better.
_________________________
http://ducttapeadk.blogspot.com