Cold start is not a “limitation” of serverless, it’s just a product of its nature - the same factor that makes serverless attractive also creates the incidence of cold starts but there are many ways to mitigate it, if it becomes an issue.
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You can use provisioned concurrency to avoid cold starts: dashbird.io/knowledge-base/aws-lam....
Or even a third-party library (e.g. JS: npmjs.com/package/lambda-warmer or... pypi.org/project/lambda-warmer-py/) to take care of it themselves.
Cold start is not a “limitation” of serverless, it’s just a product of its nature - the same factor that makes serverless attractive also creates the incidence of cold starts but there are many ways to mitigate it, if it becomes an issue.