Hi there @Reptilias,
Thanks or sharing this additional info from your tests!
I’m guessing that your SMS subscribers is the list that SMS users will be added to once they hit the ‘submit’ button for the phone number part of your multi step signup form correct? I would investigate if your list is set to double opt-in, if so, users will need to confirm their SMS subscription once again after their submitting the form. So the lag could be users not confirming their SMS subscription a section time or that a user might take their time responding to the message itself.
Is your ‘New Subscribers’ a segment? I would investigate your segment conditions again to ensure that users who submit the form meet your specific conditions, as well as taking a look at our segment updates documentation to learn how our segmentation processing works.
It should be noted that as segments differ from list, ie. users have to qualify for this dynamic grouping of profiles based on properties or conditions they meet, segmentation requests are processed as close to real-time as possible. This means your segment will update shortly after a customer takes an action that qualifies them based on the definition you created (e.g., placing an order or opening an email). In some cases, a high volume of segmentation requests across our customer base can cause delays.
Hope this helps!
-Taylor
