Out-of-date drivers and operating systems can cause a variety of issues, and are one of the first things to check when a game is having problems.
Troubleshooting steps for disconnection issues when playing Diablo III.
Troubleshooting steps for latency problems in Diablo III
Troubleshooting steps for performance-related problems.
Information about error BLZBNTKEY00002034.
Follow these steps to troubleshoot problems with your low-speed or wireless internet connection.
Information about error BLZBNTKEY00002037.
Use the steps below to troubleshoot installation issues for Blizzard games.
How to obtain error logs for Blizzard games
How to reset in-game options