Benchmarking AWS Lambda Cold Starts Across JavaScript Runtimes
Briefly

A cold start time is the total time a user must wait for the first request to an uninitialized runtime, impacting latency-sensitive applications like real-time gaming and e-commerce.
Tail latency, or high-percentile latency, is a significant metric as infrequent delays can heavily impact user experience and revenue, making cold start time performance crucial.
Read at Deno Blog
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