> But I imagine most banks would point to regulation as a reason for the delays

There is also good regulation e.g. the EU made it so banks process transactions within "10 seconds", including and especially cross-border transfers for SEPA countries (Single Euro Payments Area). https://www.europarl.europa.eu/news/en/press-room/20240202IP...

So banks willingly being slow with transfers is perhaps a question for your local policymaker to remind them they can do better.

And projects like Tempo are a good example of private sector forcing incumbents and government to move faster