@senza - D3D11 is the best setting, unless you need de-interlacing and a few other things that are not normally needed. The first chroma upscaling option is the important one. You want to lower that, if you're dropping frames. If you leave the second option at "let madvr decide", it will scale along with the first option.
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Henry | LG OLED65C7P | Denon AVR-X3500H | ELAC Uni-Fi x7 | ELAC Debut 2.0 SUB3030 x2 | NVIDIA SHIELD TV Pro 2019 | Plex
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