@4rigumus said in Opera GX is Very Slow Despite a Fast Internet Connection:
reinstalling Opera GX from scratch,
Including starting with a fresh "Opera GX Stable" folders in "C:\Users\yourusername\AppData\Roaming\Opera Software" and "C:\Users\yourusername\AppData\Local\Opera Software"?
What specific anti-virus and other security software (including VPNs) do you have installed?