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I guess you haven't read about what's coming down the pipeline. And regardless, 15tps is much much better than bitcoin, which still sits at 2x Bitcoin's cap. Scaling is a problem relevant to all of crypto, but one which is being worked on and will be solved.

It shouldn't have been marketed as a supercomputer. That said, it's able to scale doing off chain computation and with Casper, Raiden, Sharding.