I copy paste the message from the bug webpage Hello! We just want to give an update on this issue. We have the issue internally assigned as high priority. Our team is investigating the repro case right now. I do want to setup the expectation right. Performance issue could be caused by many different reasons and the current issue may not capture them all. So there is a chance the fix we provide to this case does not apply to other cases. We believe performance regressions should not happen without a good reason. We encourage you to submit your repro case so that we could have larger sample cases to look into. For every repro cases you submitted, once we confirmed they are not duplicate, we will take a look.