[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).


stopFailedWorkTimer(workInProgress);
        } else {
          stopWorkTimer(workInProgress);
        }
        if (__DEV__) {
          ReactDebugCurrentFiber.resetCurrentFiber();
        }
        if (next !== null) {
          stopWorkTimer(workInProgress);
          if (__DEV__ && ReactFiberInstrumentation.debugTool) {
            ReactFiberInstrumentation.debugTool.onCompleteWork(workInProgress);
          }
          
          
          // Since we're restarting, remove anything that is not a host effect
          // from the effect tag.
          next.effectTag &= HostEffectMask;
          return next;
        }
        if (returnFiber !== null) {
          
          returnFiber.firstEffect = returnFiber.lastEffect = null;
          returnFiber.effectTag |= Incomplete;
        }
        if (__DEV__ && ReactFiberInstrumentation.debugTool) {
          ReactFiberInstrumentation.debugTool.onCompleteWork(workInProgress);
        }
        if (siblingFiber !== null) {