Batch campaign too big for Birthday message

Hi all,

we are facing problems with our Bday email.

I created it like this (/blogs/marketowhisperer/2016/04/23/sending-a-birthday-message ), with batch campaign and trigger.

Problem is: the batch campaign, that just says "Date of Birth is not empty", qualifies a huge amount of people and runs for more than a day now. With loading times like this, the email would go out too late.

What can I do about this?

Best

Christin