[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).


error = e;
        }
      }
      if (didError) {
        invariant(
          nextEffect !== null,
          'Should have next effect. This error is likely caused by a bug ' +
            'in React. Please file an issue.',
        );
        onCommitPhaseError(nextEffect, error);
        
        if (nextEffect !== null) {
          nextEffect = nextEffect.nextEffect;
        }
      }
    }
    stopCommitSnapshotEffectsTimer();
    
    
    
    nextEffect = firstEffect;
    startCommitHostEffectsTimer();
    while (nextEffect !== null) {
      let didError = false;
      let error;
      if (__DEV__) {
        invokeGuardedCallback(null, commitAllHostEffects, null);
        if (hasCaughtError()) {
          didError = true;
          error = clearCaughtError();