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Since lamba is already handling the backend api calls, couldn't you just host the html and js in s3/cloudfront and not have to host anything?

It is a bit slow still. Jitsu[1], which starts unikernels is fast enough to do per request image booting, but Amazon seem to have a 1s cold start which is just a bit slow.

[1] https://github.com/mirage/jitsu

Ah, so there is a 1s cold start. I couldn't understand how they managed to get a container (which I imagine they are using?) running "within milliseconds". I guess the millisecond claim only holds for concurrent requests then?

Seems so for the measurements I have seen yes. Concurrent or close before it has been shut down.

This is the one thing I need to make them useful! This would make Lambda's so much easier to invoke, without needing to build custom code to put together an SQS message or similar.