Load test the site to determine the user limit

[rupl]

If this thing is to be used at scale (at public events and so forth), we need to determine how much traffic a single server node can handle. Load testing is in order. I asked twitter and got a few links which I'm just dropping here to start my own discovery:

• WebDriver + JMeter load testing using various agents, perhaps via BrowserStack?
• websocket-bench custom tests that may be able to plug into other libs, e.g. a monkey test
• A fleet of Phantom or Casper agents with pre-programmed scripts (might be much easier for me to use pre-existing knowledge to simulate drags this way) — could definitely be combined with client-side monkey testing
• The Twitterverse suggested loadimpact.com and prosthetic-hand, a tool to simulate gestures.

Following that discovery process, we need to safeguard the app against it. Here are the options:

1. Limit users to a safe number below the threshold uncovered during load tests
2. Learn how to scale the app :bowtie:
3. Implement #11

1 is fairly easy but limits bustashape's potential. It's the short-term solution. 2 is a huge question mark that I maybe can do myself but maybe not. But hey, better to know our limits!

[rupl]

I heard from @afragon that he's seen up to sixty people use the app concurrently! That's way more than what I had in mind. This can probably be put on the backburner until we hit another order of magnitude.