Easiest place to play this game online.

Press CTRL+F12 with focus on the emulator to allow more memory to the game, otherwise a large bit of lag will persist. Adding too much memory may cause other issues, decrease memory with CTRL+F11. I find pressing CTRL+F12 about 20 times is decent enough.

Press F6 to increase game speed, and F5 to decrease game speed. This is allowed in the speedrun as it's an in-game tool, and honestly, anyone with enough skill to play at max speed deserves the record. The game will reset to default speed every time you quit to the main menu.