Why am I seeing random gaps between requests?

[amrutapunebus]

I’m trying to get to the bottom of a slow load time for a site. I’m currently using Chrome’s Network Waterfall visual, and I’m seeing a few long gaps between a request being fulfilled and the next one starting. I don’t know if this is something very specific to my project that I need to try and track down in the code, or if there is a general reason why this might be happening.