Easing Slider Image Quality Problems

I have recently got easing slider onto my homepage of my colorway based site.

However the image quality is very poor even though when i was simply displaying the same images as static pictures they were very high quality.

I am ok in photoshop and have no problem editing images etc so i know they are of the right size and quality but I am guessing there is a limiting factor in the plugin.

Any help would be really appreciated

the site is https://www.sjsmithhomeandgarden.co.uk and you can see the same images on the portfolio page which display as good quality.