Deoldify Vapoursynth filter

[Dan64]

I was able to reproduce the problem.
It is just enough to close the preview and reopen it to observe a significant increase in the memory usage.

Dan

P.S.
I tested it with my coloring scripts. They use only DeSpot, mcdegrainsharp, ddeoldify, CAS
The memory usage increase to about 3.8GB, but then remain stable, I was unable to increase the memory usage ove 4GB, even closing and reopening, running the script several times.
I suspect that the memory leak is due to some filter used in your script.