Failed update

This update deserves no star.

1) Lag in launching the app
2) Lag in loading up the new messages
3) Notification issues others are mentioning
4) Often new messages are marked read when I open the app, not the chatroom.

My phone is iphone 6s, and I believe it is fast enough phone and hasnt had any issues so far, so the issue is at this update.

Mike yj Jung about KakaoTalk, v5.9.0