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Opera freezing and running painfully slow after installing version 58

  • Whenever I open Opera, my antivirus (Trend Micro) uses up to 70% CPU and Opera goes from a complete whitescreen to slowly loading pages. Trying to load unpacked extensions results in an immediate freeze with the small pop-up explorer showing no folders. After crashing or closing it, the task takes a minute to disappear and for my antivirus to calm down.

    Same story on my laptop: everything worked fine until I updated to version 58.
    I thought downgrading to version 55 would help but it did not.

    I contacted Trend Micro's customer support but they were not able to help me

    Other browsers such as Firefox work flawlessly

    I tried:
    reinstalling Opera (versions 58 and 55)
    disabling various extensions
    disabling my antivirus (which resolves the issue temporarily) (!)

    OS:
    Windows 8.1 (latest updates installed) and Windows 10 on my laptop
    Trend Micro 'Maximum Security' Version 15.0.1212