While it's true in some regions, most of the globe banking is still very slow. In any digital currency, like cryptocoins of CBDC it's the same globally, not per region.
There's no reason whatsoever that a crypto payment would be faster than a traditional payment - in fact, there's a ton of reasons the lower bound is much slower.
This is an intentional process decision, combined with some (replaceable) outdated technology. However, the former strictly dominates the latter.