Sorry for the lack of Tetris Tuesdays game days. I was trying to make it into "a thing" but after a few tries it "wasn't taking" due to a lack of players. But if there is enough interest, I can try again during the next Tuesday or the one after that. Any takers?
As far as the game itself goes, yes, those performance issues are normal. This game has a low FPS and it gets worse as the game speeds up. As a matter of fact, when I was playing it the other day I had a Tetris piece GO OUTSIDE OF THE PLAYFIELD. Somehow it emerged outside of the bottom left side by one column! The game actually wouldn't count the piece as having landed on the bottom of the field nor continue until I pressed "Right" to move it back into the playfield. I wish I had captured a screenshot or video of it!
Sadly enough, The Next Tetris / The New Tetris plays better on (almost?) all of the other platforms. The DC one has slowdown and frame-skipping issues and I can't help but believe it to be a Windows CE issue. Both of the Windows CE-based Dreamcast games that I own have these sorts of problems whereas the games that are native to the Dreamcast don't have these issues and generally have much higher (30 or 60) FPS.