Lazy Load Stack for iFrames?

Hey all,

is there a Lazy Load Stack for iFrames? Rapid-Ideas released one but it’s only for images.
Or a different approach: Is it complicated to incorporate a custom js script into Rapidweaver?
Like this one:



Apparently there is a way to make Soundcloud iFrames load faster, which is exactly what I want to achieve. But I can’t get my head around it, respectively: it doesn’t work for me :frowning:
Maybe somone can help here?