No, this is NOT sped up. This is real time. 40 lines, less than 20 seconds. That's an average of more than 2 lines per second, and represents a new record.

Of course, this is in NullpoMino - a Tetris clone that allows for more modifications about rotation and drop speed. Still, the reflexes necessary to make the above video happen are basically beyond anything you can imagine.

In case you were interested, here's the record it smashed - the incredibly fast 19.46 seconds just demolished this plodding, slow-as-hell 19.68 seconds (by the same player, keroco):