Why is KNLMeansCL slowing me down so much

[Selur]

Since I'm not aware of any changes in any of the used filters that would explain such a speed drop and I assume that you before used the same settings, a similar source (same resolution, format, etc.) and didn't change which graphic card is the first one in your system try whether is changes anything if you:

• set "Filtering->Vapoursynth->Misc->Source->Libav hardware decoding mode" to '2' this way the decoding of the source should be done through the decoder chip of the gpu.
  
• Try whether changing "Filtering->Vapoursynth->DeNoise->KNLMeansCL->Device type" and "Filtering->Vapoursynth->DeNoise->KNLMeansCL->Device type->Device" to test whether it changes anything if KNLMeansCL runs on the CPU, CPU-GPU or AMD card.
  
• adding the filters one by one to see which one is the bottleneck, like I stated on my system it isn't KNLMeansCL.
  

Cu Selur