When encoding, noise looks like detail to encoder, and so it has to try hard to retain the false detail and so larger less compressable result.
Denoise, produces smaller, and less nasty results, some on-site prefer a little noise, I'm not too keen on noise at all.
I like McDegrainSharp() with default settings [in avisynth], although the sharpening will not produce quite as dramatic a reduction in size,
so can just use McDegrain if better compression required. Many prefer TemporalDegrain2, I'll have to try it one day.
Also Limiter() after any denoise will eliminate out of TV_Levels range color components with further reduction in size likely.
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