When a product is added to cart, the whole cart bar is dynamically shown, blocking a good chunk of the right side of the screen. This rips the buyer out of the shopping process, especially when the customer wants to fast add a couple of different products.

Instead, a small popup in the any corner of the screen, showing the picture, name and the overall cart value would be sufficient. It could also have a button, where you can then access the whole cart.

That way the buyer has the confirmation that the product indeed was added to the cart but it does not rip out the buyer from the rest of their shopping experience.