I encode a lot of Blurays for my Plex server on my PC. I normally run Handbrake and also mine Etherium at the same time and never had any issues. A few weeks ago my GPU performance suddenly decreased. When I stopped Handbrake it went back to normal. Ever since then when I start Handbrake my GPU 3D goes from 4% usage to 60%.

Is there some other setting besides NVENC that causes Handbrake to use the GPU?

Here are the settings for the preset I normally use.

{
  "PresetList": [
    {
      "AlignAVStart": false,
      "AudioCopyMask": [
        "copy:aac",
        "copy:ac3",
        "copy:dtshd",
        "copy:dts",
        "copy:mp3",
        "copy:truehd",
        "copy:flac",
        "copy:eac3"
      ],
      "AudioEncoderFallback": "av_aac",
      "AudioLanguageList": [
        "any",
        "und"
      ],
      "AudioList": [
        {
          "AudioBitrate": 512,
          "AudioCompressionLevel": 0,
          "AudioEncoder": "copy",
          "AudioMixdown": "7point1",
          "AudioNormalizeMixLevel": false,
          "AudioSamplerate": "auto",
          "AudioTrackQualityEnable": false,
          "AudioTrackQuality": -1,
          "AudioTrackGainSlider": 0,
          "AudioTrackDRCSlider": 0
        }
      ],
      "AudioSecondaryEncoderMode": true,
      "AudioTrackSelectionBehavior": "all",
      "ChapterMarkers": true,
      "ChildrenArray": [],
      "Default": false,
      "FileFormat": "av_mkv",
      "Folder": false,
      "FolderOpen": false,
      "Mp4HttpOptimize": false,
      "Mp4iPodCompatible": false,
      "PictureAutoCrop": false,
      "PictureBottomCrop": 0,
      "PictureLeftCrop": 0,
      "PictureRightCrop": 0,
      "PictureTopCrop": 0,
      "PictureDARWidth": 0,
      "PictureDeblockPreset": "off",
      "PictureDeblockTune": "medium",
      "PictureDeblockCustom": "strength=strong:thresh=20:blocksize=8",
      "PictureDeinterlaceFilter": "decomb",
      "PictureCombDetectPreset": "default",
      "PictureCombDetectCustom": "",
      "PictureDeinterlacePreset": "default",
      "PictureDeinterlaceCustom": "",
      "PictureDenoiseCustom": "",
      "PictureDenoiseFilter": "nlmeans",
      "PictureDenoisePreset": "ultralight",
      "PictureDenoiseTune": "film",
      "PictureSharpenCustom": "",
      "PictureSharpenFilter": "off",
      "PictureSharpenPreset": "medium",
      "PictureSharpenTune": "none",
      "PictureDetelecine": "off",
      "PictureDetelecineCustom": "",
      "PictureColorspacePreset": "off",
      "PictureChromaSmoothPreset": "off",
      "PictureItuPAR": false,
      "PictureKeepRatio": true,
      "PictureLooseCrop": false,
      "PicturePAR": "none",
      "PicturePARWidth": 0,
      "PicturePARHeight": 0,
      "PictureWidth": 3840,
      "PictureHeight": 2160,
      "PictureUseMaximumSize": false,
      "PictureAllowUpscaling": false,
      "PictureForceHeight": 0,
      "PictureForceWidth": 0,
      "PicturePadMode": "none",
      "PicturePadTop": 0,
      "PicturePadBottom": 0,
      "PicturePadLeft": 0,
      "PicturePadRight": 0,
      "PresetName": "4k Plex",
      "Type": 1,
      "SubtitleAddCC": false,
      "SubtitleAddForeignAudioSearch": false,
      "SubtitleAddForeignAudioSubtitle": false,
      "SubtitleBurnBehavior": "none",
      "SubtitleBurnBDSub": false,
      "SubtitleBurnDVDSub": false,
      "SubtitleLanguageList": [
        "und",
        "eng"
      ],
      "SubtitleTrackSelectionBehavior": "all",
      "VideoAvgBitrate": 0,
      "VideoColorMatrixCode": 0,
      "VideoEncoder": "x265_10bit",
      "VideoFramerateMode": "cfr",
      "VideoGrayScale": false,
      "VideoScaler": "swscale",
      "VideoPreset": "slow",
      "VideoTune": "",
      "VideoProfile": "auto",
      "VideoLevel": "auto",
      "VideoOptionExtra": "",
      "VideoQualityType": 2,
      "VideoQualitySlider": 26,
      "VideoQSVDecode": false,
      "VideoQSVAsyncDepth": 0,
      "VideoTwoPass": true,
      "VideoTurboTwoPass": true,
      "x264UseAdvancedOptions": false,
      "PresetDisabled": false,
      "MetadataPassthrough": false
    }
  ],
  "VersionMajor": 47,
  "VersionMicro": 0,
  "VersionMinor": 0
}

Any help is much apreciated!