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Serious lag, low framerate while scrolling a PDF

  • As I said in the title I'm facing an ugly constant lag while scrolling PDFs, independently of their size.. I just have an approximately 15-25 fps scrolling animation... This occurs only using Opera GX's pdf viewer, whereas using Edge I can scroll really smoothly at 144 fps (my monitor refresh rate).

    Any fixes? Thanks for reading!

    (also I noticed that the framerate returns normal during the super-short animation where the grey title bar shows/hydes)