Umm. Each time you switch to a new tile there has to be texture swapping and stuff. You should try to put as many tiles as possible onto as few images as possible and then just draw parts of those images - and make sure you are grouping together the tiles that are drawn from the same `current` image first before switching to another image. That will help somewhat, but maybe not if you are on a purely software-emulated GL implementation.
Optimazion issues... Whats with BlitzMax?!
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