I have used Opera (satisfactorily) for many months (maybe years), however, recently, it seems to be suffering from memory restrictions.
Symptoms such as extremely slow opening of some sites and things like BBC News videos 'This content doesn't seem to be working - Please try again later" - yet opening the same site in Firefox works OK.
Max Verstappen looks back at debut F1 season - BBC Sport runs on Firefox but not on Opera.
It seems this operates under Adobe Flash Player - or, at least, it doesn't!
Even closing all other tabs (and windows) doesn't resolve the 'not working' issue (nor does rebooting solve the problem.
I'm running W8.1 on an Aspire E15 Start ES1-512-C50S laptop with Intel Celeron N2840 8GB DDR3 and 1000 GB HD (847 GB free space).
Add-ons to Opera include AdBlock Plus (it seems worse with AdBlock disabled) and Forecast Plus and Google Analytics opt-out and Reminders (though none in effect).
One of the messages that seem to slow the response is something called outbrain IIRC.
What do you suggest?