I don't think the to things are connected. I will investigate it when I get back from my vaccation in 14 days. Also try this script and see if it works and if it is faster than your current script:
Code:
SetMTMode(2)
mpeg2source("E:\VTS\Test\menue\d2v\sw4.d2v")
LeakKernelDeInt(order=1, threshold=5)
c=ConvertToYUY2
SetMTMode(5)
c.Distributor()
PixieDust(4)
SetMTMode(2)
VagueDenoiser(threshold=2,method=1,nsteps=6,chromaT=0.8, wiener=true, wratio=2)