Recommendation for Free Lazy Loading Extensions Magento 2

i’m looking for recommendation for free lazy loading extension that is likely works for magento 2.2.9 with infortis ultimo theme.

here are some list i found:

-welt MAGENTO 2 LAZY LOAD PRODUCTS AND IMAGES.

-bss Magento 2 Lazy Load

-magezon Magento 2 Lazy Load Extension

-Magento 2 Image Lazy Load Extension

have anyone try any of them, and recommended or not recommended?