Use cycle2 with progressive loading in Haml

cycle2.html.haml

.cycle-slideshow.auto{data: { cycle_loader: true, cycle_progressive: "#slideshow-images" }}

  -# default image loaded
  = image_tag "image0.jpg", alt: ""

  %script#slideshow-images{type: "text/cycle"}
    - image_count = 6
    [
    - (1..image_count).each_with_index do |i|
      - path = image_path("image#{i}.jpg")
      - comma = "," unless i == image_count
      :plain
        "<img src='#{path}' alt: ''>"#{comma}
    ]