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How do i set up the GOG DOSBox Configurator for the best performance ? Any help will be appreciated .
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That's very much a matter of opinion... by default it will go for 2x native resolution with doubled pixels, in other words 640x400.

For me, I like using a better scaler (even if its use is limited in Rayman because the look isn't that cartoony), so I opened up dosboxRayman.conf and set scaler=advinterp3x . That had the drawback for me that it didn't get full-screen, so I added a custom 960x600 resolution in my display driver's settings and set fullresolution=960x600
rayman000.png (243 Kb)
Post edited March 29, 2011 by hansschmucker
Also make sure to set the output method to one of the accelerated ones to make use of graphics acceleration for scaling to fullscreen:
output=ddraw or output=opengl