It wasn't supposed to be more efficient (it wasn't, and which you can compare to the tens of thousands machine gunned in 1 day in the Aktion Erntefest in 1943, following preparations of course), but more humane. In particular more humane for German personnel (who furthermore were barely involved in it in any way, due to the heavy Sonderkommando use in addition to the employment of the Soviet Trawniki-Manner, almost as disposable as they would have been otherwise likely starved or worked to death in a Wehrmacht-run Russenlager - more humane to them, too, yes).
We're not Soviets.
An actual door (from Majdanek): https://encyclopedia.ushmm.org/content/en/artifact/casting-of-majdanek-gas-chamber-door
It wasn't supposed to be more efficient (it wasn't, and which you can compare to the tens of thousands machine gunned in 1 day in the Aktion Erntefest in 1943, following preparations of course), but more humane. In particular more humane for German personnel (who furthermore were barely involved in it in any way, due to the heavy Sonderkommando use in addition to the employment of the Soviet Trawniki-Manner, almost as disposable as they would have been otherwise likely starved or worked to death in a Wehrmacht-run Russenlager - more humane to them, too, yes).