I have run some tests on my emulator and watch game play from an actual NES system. How are the top runners moving so fast across the vines?

I have not been able to do this on emulator and have never seen anyone do this on NES system.

Thanks for any info.

When climbing on a vine, press which direction you want to go, then you'll move faster. Don't hold down, just press it one at a time. The WR has input display in the bottom left corner.

I tried that but it didn't work. I tried mashing the D-Pad to the right and Jr. still went the same speed. Wonder if it is my setup or something.