Here's what we found out:
- The current API we're using for Facebook supports XML and that it does not support JSON
- The current API also does not allow gzip-encoding
Both of these things were a huge bummer, but since it's what we have to work with I continued on. I did some tests and found that about 500 friends was about 50KB of data. Now, this might not really sound like much in the world today, but it takes a whopping 550ms to complete. That's crazy for only 50KB of data! Now, considering that because of the way TCP works, this is 6 round trips and our ping to Facebook is about 70ms, 420 of that 550ms is wasted in TCP overhead. Now, there is nothing I can do about the TCP overhead (though it will be much better in our hosted environment) it's definately something I will keep in mind when dealing with our other REST apis.
Just to satisfy the curiosity of my mind I calculated that each friend was about 100 bytes of XML. If I were to convert to using the Facebook graph API and I switched to using JSON as my data format it would be more like 80 bytes per friend. While that's a nice savings it's even better if you then use the compressed json stream, which is only 15 bytes per friend.
I think it might be time to do some rewriting...
--Colt
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