whatsapp for Businesses app is very slow, taking time to sync all the messages in my iphone 12 pro max

Hi ,

I have a 12 pro and 14 pro max with whatsapp businesses app installed, I dont see any issue in my 14 pro max but in my 12 pro the whatsapp for business app is responding dead slowly to sync my messages it takes almost 5-8 mins , I cant call or even if i send a message it wont go immediately it waits until all the latest messages are synced then the message will go , I am super frustrated with this issue since I will get high volume of whatsapp enquiries for my business . Please let me know if there is any fix for this.

Thanks,

Dilip