The Tetris community at Hard Drop is, as you'd expect from people joining up to a community based around the game, pretty damn good at Tetris.
How good? Intimidatingly good.
This here is a world record run in the "40 line" category from user LapSiLap, who cleared the required lines in just 21.90 seconds.
For a further reminder of just how hardcore competitive Tetris gaming is, check out this documentary.