Don't mess with OpenGL unless you want it to get even slower on the integrated graphics card. Focus on optimization in DX. You could try loading all the tiles as a single image and drawing from the proper section with a custom DrawImageRect command (many are around), but from my experience trying to replace LoadAnimImage never produced a big enough boost in speed to warrant going to the trouble. The fact is that rendering double tile layers or more at 800x600 is going to get slow in any version of Blitz.
Optimazion issues... Whats with BlitzMax?!
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