Oh? Do tell. It'd be useful if I could run Next with no slowdown.
Here's what I did, but it may differ depending on your computer's hardware ( ie, the graphics card, but with your vids, it should be fine)
Under MotherBoard Setting, under CPU, set the Type to i486DX (someone else suggested this but, to me, both options are the same result)
Set Clock to Auto (this is what fixed the slowdown for me so Mima isn't very laggy.
Frame Rate is 1.00 and memory size is the 64 MB.
In the Device Manager, click *GDC.nhw and click Setting. Set the Frame Skip to AUTO, which works for me at the moment.
Everything else should be fine.
Let me know how it works for you and if it doesn't, I'll try to help!
P.S. If it's any help for anyone reading this post, I'm running Windows 7 32 bit with a not that great graphics card. (but it works

)
EDIT:
Never mind about what I said about it working. It WAS working. Now it's worse for whatever reason to where the flower tank is very lagged. Once I figure this out I should make a topic on this and for other emulators since I can figure them out, usually.
Well, it's working again. My solution? I didn't do anything except close it and reopen it several times when I was checking what the buttions did on the net. Weird, guess my computer had a hiccup.
Btw, any chance that the ending credits will be translated too?