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Hi,
Is it necessary to use texblend to flip between the textures? Can you simply apply the new texture to the tile once it is loaded, overriding the old one?
I'm not clear on what you are doing in the second method. Is it loading both sets of textures into memory at once, then toggling between them?
If this is the case then the first method won't have as much memory issues since you are loading the tiles on demand, but you will have performance issues from the loading.
The second method requires more memory, but if all the data fits into memory then the performance should be better than the first method.
For your case memory seems to be more of a bottleneck, so I would prefer the first method.
Let me know if I misunderstood anything.
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