Dragons Performance Updates

Dragons Performance Updates is a Hearthstone patch released on Dec. 16, 2019. It was versioned 16.0.3 with the build number 38203. It was released during the expansion Descent of Dragons

Quote From Kaeyoh

We’re currently putting out an update with various performance improvements for Hearthstone (especially for Battlegrounds). This update is live on desktop today, with the mobile update rolling out tomorrow.

As a side note, balance changes are still coming later this week. Stay tuned!