Moved from S8+ to S10, SMS-es coming slower

Recently I moved from my Samsung Galaxy S8+ to Samsung Galaxy S10.

One thing that caught my attention is the time required for an SMS to arrive after being sent by a service that uses SMS messages to 2FA logins.

On S8+, the SMS would come about the same moment I click button on the website. On S10, that process does take some three seconds.

The question is: is that normal? Maybe S10 is a smaller device with less powerful hardware to talk with the provider. Maybe the same sim card* that I have been using for the last six years needs to be replaced. Or such.

Happy to have a chat about it here. Thanks.

* – This card originally came in the standard size. It had been cut down to the nano size.