Facebook sdk.js loading delays page load

The Facebook Javascript code is already loaded asynchronously and is done in the way that Facebook recommends for the least load intensive way. The file needs to be loaded, but the asynchronous way that we're doing it shouldn't be blocking other elements from loading on the page.

Also, please note that the Facebook Javascript file is cached by browsers and most users have already visited a site that will load that file. That means that tools like GTMetrix will show it takes some time to download. Most standard users will already have that file cached when they visit your site (and definitely as they navigate to different pages), so the impact should be minimal in most cases.

I hope that helps,
Alex