Mobile Performance Boost

Mobile Performance Boost is a Hearthstone patch released on July 26, 2016. It was versioned 5.2.2 with the build number 13807. It was released during the expansion Whispers of the Old Gods

Official Patch Notes

Quote From Blizzard

In this Hearthstone update we fixed a few bugs!

Read on for details!

(Note: this update will be available for Mobile platforms in the near future)

• We fixed an issue that prevented some players from starting a game
• Morgl’s hero power is now correctly animated
• Your quests should now display correctly
• [Mobile] Performance has been improved for mobile devices and tablets
• [Mobile] Those pesky vines that could show up during the mulligan phase have been pruned from Standard icons
• [iOS] iPhone SE should now display the correct UI
• [Apple] Addressed a crash on iPhone 6 Plus and Mac devices