Some questions about texture replacement.

[[Unknown]]

Currently it only supports PNGs. Other formats are possible, but someone needs to implement it.

Zip probably is not a great trade-off for performance. You probably wouldn't see better performance or decompression compared to PNGs, I don't think. There are other methods of compression that might help more.

If you're after an uncompressed zip, just to have a single file, that probably wouldn't be an issue for performance. Again, someone would need to implement it.

-[Unknown]