Sending messages with Shout can be slow.
Sending messages with the Shout module can seem fairly slow, this is especially true if you have the "groups as branches" setup rather than using Alayacare branches.
Why?
In order to build a current and accurate list of recipients, we have to make multiple requests to Alayacare. This is a limitation of Alayacare's API but is also intentional for the purposes of security.