Can I disable image blurring while loading?

The module displays a blurred image until the actual image (jpg/png, or webp if conversion succeeds) is loaded. This is done, among other reasons, to minimize Cumulative Layout Shift.

If you don't want to display the blurred image, you can easily disable this.
Just create an empty file on your store's server at this location:
/themes/{your-theme-name}/modules/pshowlazyimg/views/css/lazyload.css
(you may need to clear the cache via the store admin panel).