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. Unlike modern browsers that use massive amounts of RAM, Opera 12.1—the base for this portable build—was the final, polished evolution of Opera’s own independent technology. It was prized for: Extreme Customization:

The term "portable" typically implies that the software does not require installation and can be run directly from a storage device, such as a USB drive, or in this context, likely from any folder on a device without leaving a footprint. old opera mini download 121 mb portable