"Our API is fast" is a feeling. A p99 in a JSON file is a fact. Let's build the thing that gives you the fact. Every sports data API says it's fast. Orbistats lists a sub-50ms live feed on its homepage, and plenty of other providers make similar claims. The trouble is that a latency number depends on what you measure and how, and a vendor's number is almost never the number your users experience. So instead of trusting anyone's page, we're going to build a small benchmark toolkit that meas...