Massive difference in response times between US and EU

Hello everyone,

I’m currently working on an app and have only collected EU data so far. But now I also plan to use US data. I noticed that when I pick up auctions from EU, I wait about 2 seconds for a response per realm, while with US realms it takes about 12 seconds. The amount of data is approximately the same for these realms.

This is the EU endpoint (response in 2 seconds):
https://eu.api.blizzard.com/data/wow/connected-realm/3691/auctions?region=eu&namespace=dynamic-eu

And this is the US endpoint (response in 12 seconds):
https://us.api.blizzard.com/data/wow/connected-realm/3676/auctions?region=us&namespace=dynamic-us

Am I doing something wrong or is this normal?