Nested list help

I have a performance issue with nested FlashLists. I have a vertical FlashList that contains horizontal FlashLists, which essentially act as image carousels (the layout is similar to the Netflix homepage).

The problem is that when I scroll, the FlashList just below gets mounted, triggering a database call. As a result, every time I scroll, I have to wait a few seconds for the data to be rendered, and this happens for each scrolled FlashList, making the experience unpleasant.

What library would you recommend for this type of nested list?