I'm afraid I'll be lurking for some time as I'm in the process of (soft) launching a product. But I like the pure java approach. While serverless is much more mature (obviously, duh!) it is however Node centric (which is great if you are in the Node universe).
According to my tests it does not exceed 300-400 ms but for a function that has steady traffic, cold start happens so rarely, so it is not a problem. Once lambda is already warm, a basic controller can return the response in 1.5 ms with lambada framework
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[ 3.3 ms ] story [ 24.0 ms ] threadAlso maybe consider adding a Gitter channel.