This solution worked for me . really good. renoirIII made it.
blurry images on featured products
It should be easier than that…
1. change your thumbnail size in Woo to, say, 150 x 150
WC Settings >> Catalog >> Image Options
2. change your thumbnail size in WordPress to 150 x 150 also
WP Settings >> Media >> Image Dimensions
3. install and run Regenerate Thumbnails plugin
As this will only apply to new images, retrospective resizing should be done with Regenerate Thumbnails – its pretty easy
Your “related products” and “You may also like” images should be looking fine if you have uploaded your images larger than 150 x 150
