Elixir's core advantage for real-time systems is the BEAM virtual machine's process model: each connection or session runs as its own lightweight, isolated process costing about 1 KB of memory, which let a single Phoenix server hold roughly 2 million concurrent WebSocket connections in a widely cited 2015 benchmark. That density, plus OTP's built-in supervision for fault tolerance, is why chat, gaming, and messaging platforms lean on it over thread-per-request stacks.
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