[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).


const currentTime = recalculateCurrentTime();
          expirationTime = computeInteractiveExpiration(currentTime);
        } else {
          
          const currentTime = recalculateCurrentTime();
          expirationTime = computeAsyncExpiration(currentTime);
        }
      } else {
        
        expirationTime = Sync;
      }
    }
    if (isBatchingInteractiveUpdates) {
      
      
      
      if (
        lowestPendingInteractiveExpirationTime === NoWork ||
        expirationTime > lowestPendingInteractiveExpirationTime
      ) {
        lowestPendingInteractiveExpirationTime = expirationTime;
      }
    }
    return expirationTime;
  }
  function scheduleWork(fiber: Fiber, expirationTime: ExpirationTime) {