The Bark Side review for Point of Sale

I'm looking for a new POS system. The checkout just hangs, sometimes as you're trying to add a product to cart, other times before loading the payment screen, and at other times when completing the payment. It's awful, even more so since the most recent update. It's also cumbersome to add products to the cart in the first place. POS needs to be quick, and at the moment I'm losing customers because of this awful app. I'm heading into my busy part of the year and I simply cannot rely on this app. If Shopify want to see what a good POS app looks like, then see how Zettle's works - it's head and shoulders above this one. I wanted to be able to run my ecommerce store and POS via the same company, but now it's looking like I'll need to revert to Zettle for POS and keep the store with Shopify. That's more work for me, in terms of adding and syncing inventory, but this app is barely usable. Another minor issue is that, as the checkout is loading, the margin (in actual GBP) pops up quickly. How would a customer feel if they saw that? My life flashes befoe my eyes each time as I try to shield the tablet from them. Seriously, Shopify - do better. in the meantime, I'll decide whether to revert to Zettle or find another provder. Awful, awful, AWFUL app.