Set the Memory to the highest value to give the best performance?
That doesn't seem like good advice on Lambda. A 128MB container should work fine.
True. A 128MB works absolutely fine, it actually only consumes about 50MB peak. However, in lambda the memory is linked to the processing power and the speed increase offsets the additional charges by being that much quicker. I was surprised myself and really I should put some quick stats in there to backup my recommendation.
Really? I run a lambda dynamo scaler that I wrote on a 128MB container and it rarely runs more than 300ms. Anything less that 100ms is a wash with the way they bill so a 2GB container would be 5x more expensive if it managed to stay under 100ms.