Hello. I am also experiencing this extremely slow Viber app issue. Swiping from the "Chats" tab to "Contacts" takes at least 3 seconds to complete! I've updated all my apps, uninstalled and reinstalled Viber... but this still happens. What's going on? It wasn't like this when I first installed the app -- it was running smooth and fast. I don't know if this is related or a factor, but I remember running the "Boost" app in my phone and then afterwards, the Viber app became so laggy.