Dear @paulinechevalier
Thank you for your feedback. I just would like to point out that if you are receiving that large amount of abandoned carts, those most probably are coming from bots that are adding all of your store products to the cart. There are multiple ways that you will need to look into in order to exclude them from your abandoned cart list. Here is a guide on dealing with bot traffic: How to prevent bots from leaving abandoned carts
Please note that you can switch to a different solution for abandoned cart recovery, but the bots will still be visiting your server and store even if you do not see them in Google Analytics stats. So you should consider strengthening your server and block these bots or they will continue to put stress on your store and make it slower.
Would appreciate if you could update your review since CartBounty is simply doing what it is intended to do and displays shopping carts for you. You can exclude anonymous carts from being saved and you will not be seeing them in your abandoned cart list, but it will still not be dealing with the root of the problem – bots visiting your store.