I already wrote you early, that this is related to your hosting speed. Try
other hosting. You can try Cloudways, they have beta free period.

It happened again and I managed to screen record it. 

Please refer to the attachment below. 

https://drive.google.com/file/d/1znc7jmZRAZahFQMPC_w7y-ipJ7QdQqOw/view?usp=sharing 

I don't see any problem. Yes, i see that it's loading slow. But this can't be changed via theme because Ajax speed is related to your hosting and number of products/categories on site. You can try other faster hosting and you will see that it's working fast. Let me know if you need some recommendations for hosting

I have a problem with the shopping cart. Most of the time when I clicked on the shopping cart, the cart sidebar came in from the right but it keeps loading and not showing the products. May I know how can I solve this? Thank you