Blurry thumbnails in mobile site

Greetings,

I am using 2012 with a child theme with very little modifications. I have noticed that when I view my thumbnail images in my Galaxy S4, they are a little blurry. I usually upload an image to WordPress and them simply use the thumbnail option linking to the full image.

I have learned how to temporarily solve the problem by using the full sized image in the post instead of the thumbnail created by WordPress, reducing its size using the percentage option and them linking to the full image. The only problem with doing it this way is that now my website will have to load the full image every time before it is even clicked on.

Thanks in advance.

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