I have been an Opera user (meaning using Opera 99% of the time I am online with my computer) for the past 4-5 years. However, today is the day when I say good bye to Opera (at least as my main browser). The reason being that for the past month Opera has become terribly slow and keeps freezing up my computer. So, I literally have to waste at least an hour or two every day waiting until it decides to wake up again. I have tried uninstalling/reinstalling, disabling extensions but no result. At the same time, Firefox seems to be working fine even with 10 tabs open.
So, even though I enjoyed using Opera, I did not enjoy wasting my time on waiting Opera to wake up. I might come back to Opera one day, if you manage to fix the issues. But until then I will prefer other browsers.