Significant Slowdown – Add to Cart Delay

I have a perfume website with your BOPO Bundles plugin. I created 12 perfumes at a certain price.
It always worked well, but recently, I believe after the last update to version 1.1.5, users started complaining about slowness. It takes a long time from clicking the ‘Add to Cart’ button until the item is added.

Here is a video I recorded that shows the issue:
https://www.loom.com/share/bfaaf7cc0b384cbca6a009e9532ce9b3?sid=f2cea51a-6013-4e79-b249-044be912cb61

It happens only on product bundles, This is the link to the product. Try adding items to the cart:
https://mtbeauty.co.il/product/10plus1small/

It was never this slow before. The site is hosted on a dedicated VPS with 8GB of memory.
It should be very fast