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I hate replying to my own post, but I just want to point out that the Node.js server is running on a Prgmr.com VPS with 128 MB RAM. The server is currently using 1.5 - 2.7% CPU and holding steady at about 43 MB of RAM with 70 connected users.

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Do you run anything else on that server? (i.e. git, blog?)

Currently just running the Node.js server.

Have you tried stressing the server with thousands of clients? I'm curious how Node.js holds up and how much RAM it uses per connection without (or with?) major TCP/IP tuning of buffer sizes, Nagle, etc.

I ask because you have no scale-out capability given that all the users are stored in a simple JS object (great for a demo of course). Any plans on this front?

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