I was doing some research today on preventing slow/flakey external javascript files from 3rd-party sources from slowing down your perceived page load times. Things like tracking pixels and chat widgets are generally loaded via script tags, and if you’re not careful then one rogue provider can create a really poor experience for users on your site. I don’t have any original thoughts here, just a collection of resources which I found that summarize techniques I’ve heard about in the past ...
