[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).


return;
      }
      fiber = fiber.return;
    }
    if (sourceFiber.tag === HostRoot) {
      
      
      scheduleCapture(sourceFiber, sourceFiber, value, expirationTime);
    }
  }
  function onCommitPhaseError(fiber: Fiber, error: mixed) {
    return dispatch(fiber, error, Sync);
  }
  function computeAsyncExpiration(currentTime: ExpirationTime) {
    
    
    
    const expirationMs = 5000;
    const bucketSizeMs = 250;
    return computeExpirationBucket(currentTime, expirationMs, bucketSizeMs);
  }
  function computeInteractiveExpiration(currentTime: ExpirationTime) {
    
    const expirationMs = 500;
    const bucketSizeMs = 100;
    return computeExpirationBucket(currentTime, expirationMs, bucketSizeMs);
  }
  // Creates a unique async expiration time.
  function computeUniqueAsyncExpiration(): ExpirationTime {
    const currentTime = recalculateCurrentTime();