What Can We Do For You?

Ans: As per the current scenario if any product with more qty is added from the "Add Opening Stock" then for the particular product qty the bar code is getting generated for each qty. So we have an option that has to be enabled to boost the process. 
Go to Setup > Inventory Register Tab > Is Merge Bar Code Enable for Opening Stock and Found Goods? this option has to be enabled after that the product with huge quantity will come faster than usual because only one barcode will get generated for all the Qty of the same product.