I am experiencing keyboard lag (DH, a vault for example, or even opening my character screen with ‘c’ key). I hit the key and the event is delayed nondeterministically by even 5 and more secs. I am using the Logitech MK250 wireless set. Only the keyboard is lagging, the mouse works perfectly ok. Changing the batteries for fresh ones does not help. The set is otherwise working perfectly in all other games and applications. This is an issue since the beginning of D3. There are no driver updates available. The distance between the keyboard and the USB stick is around 40cm. Just curious, if anybody else is experiencing the same behavior.
Is D3 the only game you play? Wireless keyboards use either RF or Bluetooth for connectivity, but noise on the 2.4GHz band can interfere with either of them (since they use an overlapping spectrum). If you use Wi-Fi for internet I would suggest either attempting to use an ethernet cable, or switching to the 5GHz band.