Hello,
The Image Background used in the Shape Dividers are loaded from an external source which is why it takes time to load. It is displayed as soon as the Image is downloaded.
If you are removing the .lazy Class, you will need to change the data-bg="https://source.unsplash.com/X4-hrX1_Jmc/1920x1080" to background-image: url('https://source.unsplash.com/X4-hrX1_Jmc/1920x1080'); and add it to the style Attribute.
This will definitely work fine. Hope this Helps!
Let us know if we can help you with anything else or if you find any further issues.