I guess that's the weird thing for me: both myself and my partner have updated to 1.4, yet I'm still noticing that their model will move/sway faster despite both frequencies being set the same for the x and y values, along with their amplitude--for whatever reason, when it's on my PC, they run half as fast. One bit of evidence I noticed to the problem was that, when looking at the rotational sliders, the rotation circle was spinning back and forth slower than on their program.
I did some looking regarding others with issues with lag or slowdown being with 30/40 series Nvidia cards? The only thing that's weird to me is that I have not experienced such issues, and heck--I already downloaded 1.4 and tested swimmingly. Only today did it start acting strange.