GDI Bypassing is a controversial technique whereby display hardware vendors alter operating system Graphics Display Interface (GDI) code to transfer control to their own hardware/PROM. Proponents claim that GDI bypassing, allows graphics hardware vendors to bypass slow, inefficient GDI calls. Opponents argue that internal data structure required for other, unbypassed GDI calls may not be properly updated and that the time savings from GDI bypassing are minimal in any cases.

Testing reported in the December 3, 1996 issue of PC magazine indicated no real world performance improvements from GDI bypassing as measured by Winstone/Winbench 97.

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