In the context of AutoCAD and GDI:
Therefore, gdi16.hdi is the "Heidi driver that allows AutoCAD to output graphics using the Windows 16-bit GDI system." autocad virtual device gdi16.hdi
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In AutoCAD, .hdi stands for . It is the system AutoCAD uses to interface with graphics devices.
If your AutoCAD Graphics Performance dialog displays instead of a dedicated graphics API like DirectX 11 or 12, your software is currently bypassing your powerful GPU. This indicates that Hardware Acceleration is disabled , forcing AutoCAD to rely on a generic software-based driver for rendering. This state often leads to laggy performance, visual glitches, and reduced productivity. What is gdi16.hdi?
Slow panning, zooming, and "ghosting" effects on selected lines. Root Causes