How quickly are text messages sent?

Delivery speed may vary based on the recipient's service and carrier, but tex) messages are usually sent in seconds and can reach delivery speeds of more than 6,000 messages per second.

Speed will also be affected by the type of number you are sending from. Using a short code, a 5 or 6 digit number, allows you to deliver a high-volume messages in a few seconds.  Using a local number, like 555-555-5555, will limit delivery to 1 message per second due to carrier restrictions.