Try to place NeatVideo before Lut/Lumetri effects in the rendering pipeline. You see, PPro considers NeatVideo plugin as non-accelerated (it makes timeline red), and so all other effects before it are rendered on a CPU. Hence extremely slow speed. Remember:
Not all effects are GPU accelerated. And order of effects matters. To make render/export faster, follow these rules:
#1. Ideally don't use CPU-effects at all (keep a timeline "yellow" = maximum speed mode)
#2. If you can't avoid using CPU-effects - don't mix up CPU- and GPU- effects in the same adjustment layer. Doing so will switch rendering into "software only" mode (=very slow). Instead separate GPU and CPU effects in two different layers. Put "GPU-layer" on top of a "CPU-layer". This way GPU-acceleration will actually work
#3. In case of applying effects directly to a clip without adjustment layers: organize effects in a way that all GPU-effects are applied after CPU-effects
#4. If by all means you have to use some CPU-only effect on top of accelerated ones - then split the job on 2 parts: first you export the timeline with accelerated effects, then re-import and add that necessary CPU-effect(s). This way it'll be much faster than CPU-only render in one pass. (or use render-&-replace instead of export-import)
#5. One more thing. PPro often consider 3rd party effects as non-accelerated even if they use GPU for rendering (Twixtor, RGMB suite, etc ). Use the following as the criteria of non-accelerated effect - its addition turns render bar from yellow to red.
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