[This example](https://codesandbox.io/s/1zn2o513pq) presents a huge performance drop between React 16.2 and React 16.3.

In investigated it and noticed several things:

- Perfomance drop is only visible using development bundle
- This is not related to styled-components (a simple div presents the same problem)
- I tried to investigate in performance tab of Chrome dev tools and I noticed that I get React measures even without "?react_perf"
- React Tree Reconciliation seems very long, do not know why

It is not a big problem for me, but it looks weird, so I decided to [share it on Twitter](https://twitter.com/neoziro/status/979756579296817154),  then @gaearon [invited me to submit an issue about it](https://twitter.com/dan_abramov/status/980036013518139398).


nestedUpdateCount++;
    } else {
      
      nestedUpdateCount = 0;
    }
    nextFlushedRoot = highestPriorityRoot;
    nextFlushedExpirationTime = highestPriorityWork;
  }
  function performAsyncWork(dl) {
    performWork(NoWork, true, dl);
  }
  function performSyncWork() {
    performWork(Sync, false, null);
  }
  function performWork(
    minExpirationTime: ExpirationTime,
    isAsync: boolean,
    dl: Deadline | null,
  ) {
    deadline = dl;
    
    
    findHighestPriorityRoot();
    if (enableUserTimingAPI && deadline !== null) {
      const didExpire = nextFlushedExpirationTime < recalculateCurrentTime();
      const timeout = expirationTimeToMs(nextFlushedExpirationTime);
      stopRequestCallbackTimer(didExpire, timeout);
    }
    if (isAsync) {
      while (