(Anonymous) 2015-07-01 08:36 am (UTC)(link)
This is just a resolution difference, though the new displays are moving towards 5k pixels. There is no way an average website will be using the space in the next 5 years. Most websites are just optimized for 900x1200 pixels these days with flexibility for mobile.
Depending what retina display model you have your viewing area can be anything from 2880x1800, 2560x1600, 2304x1440 to 5120x2880 px.
My guess its stretching the image to make it fit the same area, it makes a loss of quality.

(Anonymous) 2015-07-01 08:51 am (UTC)(link)
ahh yeah i understand why it looks gross! i spent a while researching it, trying to figure out a way to get my own images to display nicely on the web (and specifically fr, its so frustrating to see my thread graphics get fuzzy on me). i just wish fr had a way to serve retina-optimized images on the site—which is a rather unrealistic wish, since it would just eat up bandwidth :c

and 5k, really? most things aren't ready for 4k, let alone 5k!