I sometimes include multiple Soundcloud players (for different songs) on a page. I noticed that it does slow down the loading and the Google "speed score" of the page (PageSpeed Insights) because each new embedded iframe reloads the same Javascript multiple times! (I saw this with the Chrome Developer Tools, "Network" tab).
For example: the following code will download 4 times the same Javascript code.
Question: how to load the Soundcloud JS only once and display 4 players for 4 different songs on the same page?
<iframe width="100%" height="166" scrolling="no" frameborder="no" allow="autoplay" src="https://w.soundcloud.com/player/?url=https%3A//api.soundcloud.com/tracks/426202317&color=%23ff5500&auto_play=false&hide_related=false&show_comments=true&show_user=true&show_reposts=false&show_teaser=false"></iframe>
<iframe width="100%" height="166" scrolling="no" frameborder="no" allow="autoplay" src="https://w.soundcloud.com/player/?url=https%3A//api.soundcloud.com/tracks/426202317&color=%23ff5500&auto_play=false&hide_related=false&show_comments=true&show_user=true&show_reposts=false&show_teaser=false"></iframe>
<iframe width="100%" height="166" scrolling="no" frameborder="no" allow="autoplay" src="https://w.soundcloud.com/player/?url=https%3A//api.soundcloud.com/tracks/426202317&color=%23ff5500&auto_play=false&hide_related=false&show_comments=true&show_user=true&show_reposts=false&show_teaser=false"></iframe>
<iframe width="100%" height="166" scrolling="no" frameborder="no" allow="autoplay" src="https://w.soundcloud.com/player/?url=https%3A//api.soundcloud.com/tracks/426202317&color=%23ff5500&auto_play=false&hide_related=false&show_comments=true&show_user=true&show_reposts=false&show_teaser=false"></iframe>I noticed a similar behaviour for Youtube embedded <iframe>, here is a screenshot from PageSpeed Insights:
