1054 frames (17.54 seconds) faster than Baxter's published run, largely from using a new trick:

When the top row is cleared, the game seems to get confused and also clears the bottom row, counting another line (but tetrises don't clear 5 lines, it keeps a full line instead). So I score tetrises by doing triples at the top, and at the same time set up the rest for more tetrises (as leftover rows fall to the bottom). I actually found this glitch back in 2006 while doing a playaround, and had this run in mind for a long time, but it wasn't until recently that I figured out how to do it.

Placing blocks this high sadly isn't possible at level 19, but barely works at 18, so I start at 18 instead (and had to score 2 more tetrises). It's still hard to fit (and manipulate) the blocks up there, since I had to repeatedly fill the top few rows ... so I made this easier by bruteforcing again!

Overall, it went like this:

And the bruteforcing: (instant, too)

I only ran into a minor problem at some point, when the cleared bottom rows overflowed past the bottom (due to the glitch) and started blocking the way above the top row ... this sometimes forced me to use other/slower combinations, but probably cost less than 1 second.

Since this is no longer possible once I reach level 19, the last few tetrises were done like before.

adelikat: Claiming for judging. And Accepting of course!