A User Timing middleware for redux to create performance markers for dispatched actions

userTimingMiddleware.js

const userTiming = () => (next) => (action) => {
  if (performance.mark === undefined) return next(action);
  performance.mark(`${action.type}_start`);
  const result = next(action);
  performance.mark(`${action.type}_end`);
  performance.measure(
    `${action.type}`,
    `${action.type}_start`,
    `${action.type}_end`,
  );
  return result;
}

Nice one @vcarl!
I wrote a similar blog a while back: