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Opera 12 has problems with Facebook. Deleting files from the cache and the like, is a solution that will help for a short period of time, after some time the problems are back.
the same problem: https://forums.opera.com/topic/2463/opera-12-17-and-facebook-lag
Developers that already in Opera 12 probably will not be addressed.
sorry for my English
Opera 20 is the same as many other browsers that can not and nothing to me is useless. It is a pity that the development of Opera 12 is over. It's time to find a different browser.
(sorry for my english)
I have the same problem with Facebook. I do not want to switch to another browser. 