Use appropriately-sized thumbnails

[Atulin]

If the screen is high-res enough, using representations.thumb results in blurry images. Use screen width to determine the best size to use.

  @versions [
    thumb_tiny: {50, 50},
    thumb_small: {150, 150},
    thumb: {250, 250},
    small: {320, 240},
    medium: {800, 600},
    large: {1280, 1024},
    tall: {1024, 4096},
    full: nil
  ]

Source