Many actions performed in the inventory have a slight amount of input lag on them. For example, closing the inventory will happen a few milliseconds after the player presses the "E" key. This is a very slight delay but it is definitely noticeable. Some other things that suffer from this issue are selecting (left-clicking) on items in the inventory, crafting items, etc.

The entire inventory interface feels very sluggish and unresponsive when compared to the Java version.