Hello PJRandall,

From what I understand, your laptop is a netbook with an integrated Intel video card. This might be not enough to run Duke Nukem 3D as the game pushes DOSBox to its limits.

I recommend experimenting with the dosboxDuke3D.conf file in the game folder and changing the value of the output variable, e.g. changing output=overlay to output=opengl. If that won't help, try other values.

You can find more info about the Dosbox configuration file here: https://www.dosbox.com/wiki/Dosbox.conf#.5Bsdl.5D

Changing the graphic settings in-game, like changing the detail level to low or turning off the shadows might also be helpful.

Alternatively, you could consider running the game with EDuke32 project (which is an unsupported solution, but that way the game will run natively on your machine which might result in better framerate): http://www.eduke32.com/

Please let me know if this helped! I also encourage you to contact our support here: https://support.gog.com/