This is probably more down to how the graphics driver handles its textures. Some will have to do some transfer/processing the first time that you use a given texture, after which it is normal speed. It's not really BlitzMax's fault. Once it hands over the graphics data to GL/DX it's out of its hands as to how this happens. You probably will have to draw all the images once to make them current, unless anyone else knows a better idea.
Initially choppy graphics
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