Why does it take so long to show previews?

Why is taking so long to show previews?

If you are not getting previews, make sure you have not opened the same photos into any other app such as Lightroom.

Reason : Previews aren't loading means that the FilterPixel app is not getting permission to access your files.

Here's the Solution:
Quit all applications that have the same photos open in them.
Close FilterPixel app
Reopen FilterPixel app

Updated on: 27/12/2022