[HELP] Vapoursynth is terribly slow.

[Kylenam]

Source : 1080p BluRay 8bit Remux
Output : x265 10bit 
Same Settings : crop, SMDegrain, LSFmod

MySystem:
HexaCore AMD Ryzen 5 1600, 3700 MHz (37 x 100)
memory 16GB
GeForce GTX 1050
SSD 128G

Vapoursynth:



avisynth:



Encoding up to 10 percent is the same.

Is it usually this slow?