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@leocg Thanks to your answer, and your previous answers to other peoples, i was able to find an older version of Opera GX (I choosed 114.0.5282.159), and desactivate AutoUpdate and ... it s perfect, so fast, so smooth, so Opera, so GX, i'm relieved !
Thank you for your time to me and other people !
@leocg Ok, thank you for your time, I will try to search in that way ! I hope you can block update in OperaGX, i like it and I hope I can continue to use it !
@leocg Thank you, but i can only change the interface with what i see, not the software version. Maybe i'm stupid. If we can only customize the look, but not go back to previous update, too bad for me i guess. 
Since the new OperaGX update, it's way too slow on my computer, and I don't want to change for another browser. How can I go back to the old version that worked perfectly fine for me ?