Camp Muir last weekend. Found that it starts off OK but when the canister is used then melting snow times increase by quite a bit. Frost was building up on the canister which slows everything down. I was using a qt and a half pot. This time I didn't do tricks to get more power (sit canister in pot of warm water or butane lighter, or second stove or warm the unattached can first inside your coat.
I noticed that if I want to start the stove with the self ignition it wouldn't light unless I had the pot on the stove first. It would trap more fuel then the spark could ignite it.