I haven’t done extensive test, but a lot of people seems to have problems with denoiser and neatvideo not using cpu 100%
both denoiser and png images don’t like multithreading so they choke.
neatvideo has an optimize button so that it doesn’t run into this problem. it’s a thread vs cpu/ram problem.
multithreading off may change your render speed. you can test this feature.
The most important thing is to denoise clips by themselves either before or after intermediate rendered clips and not
stack them with lumetri, special effects etc. The most recommended workflow is the smart rendering feature using supported filetypes.