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+VGA Passthrough I/O Lag on DOS (FreeDOS) System.
+Description of problem:
+VGA performance lags with passthrough when the OS is in graphics mode. It also seems to affect when key presses are registered with noticeable delay.
+Steps to reproduce:
+1. Install Doom (v1.9 Shareware.)
+2. Run setup and disable sound.
+3. Play game or watch demo.
+Additional information:
+I have tried multiple cards with no change in performance:
+
+**VGA compatible controller: S3 Graphics Ltd. 86c375 [ViRGE/DX] or 86c385 [ViRGE/GX] (rev 01) (prog-if 00 [VGA controller])   
+VGA compatible controller: Advanced Micro Devices, Inc. [AMD/ATI] R480 [Radeon X800 GTO] (prog-if 00 [VGA controller])**