Hello.
Well problems starts after update. And Im not the only one. Im working as IT support guy and many people calls us for long page load.
I dont think that problem is FB Comments or something like that. It must be some kind of JavaScript or smth…
In private mode (where there is no cache and stuff in browsers) page loads quickly. But when Im at normal mode and logged into Facebook, it is getting horrible long page load time.
I tested PLT with pingdom, and its about 800ms (so 800 ms for robots, not for ppl who are logged into Facebook)
I had activated Facebook Comments, Facebook Likes, Open Graph also had one widget (recommendations). I used it to post to my FB wall (it does not work well) and using an app.
Problem starts 2-3 weeks ago.