Opera://flags/enable-parallel-downloading Portable -

Because this is an "experimental" flag, it isn't found in the standard settings menu. Follow these steps to activate it:

The "Parallel downloading" experiment should be highlighted at the top of the list. opera://flags/enable-parallel-downloading

Opening multiple connections requires slightly more CPU and RAM. On older hardware, you might notice a small performance dip during heavy downloads. Because this is an "experimental" flag, it isn't