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Luckily, the official LiteStack benchmarks include measurements for LiteCable against Redis, which I am going to quote here.
Continuous monitoring of your app's WebSocket performance metrics using tools like AppSignal is your friend here. Reusing the ActionCable consumer on the client side is also advisable, as it will prevent wasting Pub/Sub connections.
Here's what this looks like - note that I'm using Shoelace components for styling purposes.
LiteCable is tailored for vertical scaling by a tight integration of components. If you extract maximum performance from the SQLite engine, the limits of this approach are pushed a lot further. Once you observe that your latencies start to explode, though, I would suggest researching options like AnyCable, which inherently provide better strategies for horizontal scaling.