I always thought that things like Fission are best for things that will take long enough that 200ms doesn't make much of a difference such as video encoding, up

I always thought that things like Fission are best for things that will take long enough that 200ms doesn't make much of a difference such as video encoding, updating recommendations, etc. What reducing the overhead does is make it useful for more things like machine vision for images (eg: is this user uploaded image safe for work) but its still nowhere near good enough for doing a DB query that takes 1ms or serving static content.