I hope you have the solution for this problem:
whenever I start a new session of Opera, if i visit Facebook or Linkedin I have a slow loading process and if I wait, the page won't be loaded properly. In fact, if after waiting I try to interact with the page I receive no real feedback, e.g. if I click on the notifications button, the small window opens but stays steadily in the charging phase.
If I reload the page all the problems go away. It's like having to say twice to Opera what to do!
(Same problem (and boring fix) with Linkedin, but in that case the page won't load at all).
Opera version 56.0.3051.52