To set the number of maximum allowed connection under Opera (when experiencing slow browsing speed), follow the below procedure:
In the address bar, type "about:config" and press Enter.
The "Preference editor" shall open up.
Scroll to the Performance section.
Click to expand the section.
Edit the value next to "Max Connections Total" (set to 64 by default).
Click on the "Save" button located at the end of the "Performance" pane.
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