Due to limited block space on Bitcoin BTC, it is economically advantageous to combine as many payments as possible together into a single transaction. This is commonly called "batching".
Your transaction is likely to be delayed as we will wait until we have enough other payments to batch together. In return you will receive a discount on your transfer.
In conclusion, this transfer method is a trade-off between speed and fees. Don't use it when you're in a hurry. It can take up to 24 hours until we send the transaction.