Scripts optimization

I use A3 in order to optimize the performance of my website.

The plugin works very well, but I noticed that it embed TWO style sheets:

WITH FADE EFFECT
<link rel=’stylesheet’ id=’jquery-lazyloadxt-fadein-css-css’ href=’…wp-content/plugins/a3-lazy-load/assets/css/jquery.lazyloadxt.fadein.css?ver=4.9.9′ type=’text/css’ media=’all’ />
<link rel=’stylesheet’ id=’a3a3_lazy_load-css’ href=’…wp-content/uploads/sass/a3_lazy_load.min.css?ver=1545230467′ type=’text/css’ media=’all’ />

WITH SPINNER EFFECT
<link rel=’stylesheet’ id=’jquery-lazyloadxt-spinner-css-css’ href=’…wp-content/plugins/a3-lazy-load/assets/css/jquery.lazyloadxt.spinner.css?ver=4.9.9′ type=’text/css’ media=’all’ />
<link rel=’stylesheet’ id=’a3a3_lazy_load-css’ href=’…wp-content/uploads/sass/a3_lazy_load.min.css?ver=1545230515′ type=’text/css’ media=’all’ />

I don’t think that it is good. There is any way to remove the loading of these scripts without compromise the correct working of the plugin?

Thanks for every suggestions,

Marco