@Drew_DiPalma thank you very much for the realm advice.
Since i am new to mongodb atlas am realm, i assumed, when i have an atlas DB in AWS eu-central-1, and i add a trigger via the Atlas interface to that cluster, the trigger/realm app will get hosted in the same location.
Which would totally make sense imho!
I checked the realm app, which was located in virgina. I created a new realm app in eu-central-1, configured everthing accordingly and now the trigger execution only requires 20-30ms. thanks a lot.
I also want to mention, that this default behaviour is very confusing imo. I don’t know if this is well documented, and if there is any reason for it though i would never assume this default behaviour.