Probably not the same problem but a week or 2 ago my facebook started to due stupid stuff, ( unable to open notifications or open messages ect.) other sites worked fine. I was told I would have to delete and reload.
Then a smart dude suggested that I unplug my wireless router from the wall...wait a few minutes and plug it back in before doing anything else. I did and voila problem solved. Why I have no idea.
One other thing I do regularly (about once a week) is to clear my browsing history. Seems to help with browsing speed.
JOKE: Last week I was doing some research on post WW2 atomic tests and entered Bikini atol into a search ...some sites came up that had nothing about Atomic testing...but were HOT. Deleted my browsing history and washed the Ipad in the dishwasher! END JOKE LOL