Damage to the Windows Management Instrumentation (WMI) can prevent AutoCAD from "seeing" your hardware. How to Fix gdi16.hdi and Restore Performance
The most common cause is simply that the feature has been toggled off. autocad virtual device gdi16.hdi
When you see "gdi16.hdi (Software)" in your settings, it means Hardware Acceleration is disabled . Instead of using DirectX to communicate with your GPU, AutoCAD is using your CPU to emulate graphics rendering via the Windows Graphics Device Interface (GDI). Why Is AutoCAD Using gdi16.hdi Instead of My GPU? Damage to the Windows Management Instrumentation (WMI) can
If the option isn't grayed out, you can often fix this in seconds: autocad virtual device gdi16.hdi
The file is part of the HEIDI (HOOPS Enhanced Interface for Desktop Integration) graphics system used by Autodesk products.