Question

I’ve run a Pingdom.com test on my page and found out that identical JS files from Facebook are being loaded twice. Once from http://s-static.ak.facebook.com/ and another time from http://static.ak.fbcdn.net. Pingdom is reporting that the page size is 753.7kB. That’s a lot, and if you exclude Facebook resources, the page size goes down more than 60%—what a waste! Is there any way to mitigate this problem? Thanks!

Answer 1

You may need to use a channel file:

The channelUrl parameter is optional, but recommended. Providing a
channel file can help address three specific known issues. First,
pages that include code to communicate across frames may cause Social
Plugins to show up as blank without a channelUrl. Second, if no
channelUrl is provided and a page includes auto-playing audio or
video, the user may hear two streams of audio because the page has
been loaded a second time in the background for cross domain
communication. Third, a channel file will prevent inclusion of extra
hits in your server-side logs. If you do not specify a channelUrl, you
can remove page views containing fb_xd_bust or fb_xd_fragment
parameters from your logs to ensure proper counts.

The channelUrl must be a fully qualified URL matching the page on
which you include the SDK. In other words, the channel file domain
must include www if your site is served using www, and if you modify
document.domain on your page you must make the same document.domain
change in the channel.html file as well. The protocols must also
match. If your page is served over https, your channelUrl must also be
https. Remember to use the matching protocol for the script src as
well. The sample code above uses protocol-relative URLs which should
handle most https cases properly.