Всё что вам нужно сделать, скопировать содержимое и вставить в текстовый документ settings!
Копируйте от <?xml version="1.0" encoding="UTF-8"?> и до </video>,
У всех своя видюха, поэтому полностью копировать не нужно)
Вам прибавится: от 8-10, до 5-8 FPS. Проверено мной лично. От ноутбуков с Radeon HD 6570 и GTX mx570, до pc core 2duo e6600 + gt 1030 + 4 gb ddr2, 2 quad q8300 + gtx 570 + 4gb ddr3, i5 9400f + gtx 1650 + 8 gb ddr4 - rtx 3060 24 gb
Надеюсь у вас получится! Удачи.

Путь к файлу settings:
C:\Users\Пользователь\Documents\Rockstar Games\GTA V

///////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////

<?xml version="1.0" encoding="UTF-8"?>

<Settings>
<version value="1411935855" />
<configSource>SMC_SAFE</configSource>
<graphics>
<Tessellation value="0" />
<LodScale value="0.000000" />
<PedLodBias value="0.000000" />
<VehicleLodBias value="0.000000" />
<ShadowQuality value="0" />
<ReflectionQuality value="0" />
<ReflectionMSAA value="0" />
<SSAO value="0" />
<AnisotropicFiltering value="0" />
<MSAA value="0" />
<MSAAFragments value="0" />
<MSAAQuality value="0" />
<SamplingMode value="0" />
<TextureQuality value="0" />
<ParticleQuality value="0" />
<WaterQuality value="0" />
<GrassQuality value="0" />
<ShaderQuality value="0" />
<Shadow_SoftShadows value="0" />
<UltraShadows_Enabled value="false" />
<Shadow_ParticleShadows value="false" />
<Shadow_Distance value="1.000000" />
<Shadow_LongShadows value="false" />
<Shadow_SplitZStart value="0.000000" />
<Shadow_SplitZEnd value="0.000000" />
<Shadow_aircraftExpWeight value="0.000000" />
<Shadow_DisableScreenSizeCheck value="false" />
<Reflection_MipBlur value="false" />
<FXAA_Enabled value="false" />
<TXAA_Enabled value="false" />
<Lighting_FogVolumes value="false" />
<Shader_SSA value="false" />
<DX_Version value="2" />
<CityDensity value="0.000000" />
<PedVarietyMultiplier value="0.000000" />
<VehicleVarietyMultiplier value="0.000000" />
<PostFX value="0" />
<DoF value="false" />
<HdStreamingInFlight value="false" />
<MaxLodScale value="0.000000" />
<MotionBlurStrength value="0.000000" />
</graphics>
<system>
<numBytesPerReplayBlock value="9000000" />
<numReplayBlocks value="36" />
<maxSizeOfStreamingReplay value="1024" />
<maxFileStoreSize value="65536" />
</system>
<audio>
<Audio3d value="false" />
</audio>
<video>
<AdapterIndex value="0" />
<OutputIndex value="0" />
<ScreenWidth value="800" />
<ScreenHeight value="600" />
<RefreshRate value="60" />
<Windowed value="1" />
<VSync value="1" />
<Stereo value="0" />
<Convergence value="0.100000" />
<Separation value="1.000000" />
<PauseOnFocusLoss value="1" />
<AspectRatio value="2" />
</video>
<VideoCardDescription>AMD Radeon(TM) R5 Graphics</VideoCardDescription>
</Settings>

<?xml version="1.0" encoding="UTF-8"?>

<Settings>
<version value="27" />
<configSource>SMC_AUTO</configSource>
<graphics>
<Tessellation value="0" />
<LodScale value="-0.700000" />
<PedLodBias value="-0.500000" />
<VehicleLodBias value="-0.500000" />
<ShadowQuality value="0" />
<ReflectionQuality value="0" />
<ReflectionMSAA value="0" />
<SSAO value="0" />
<AnisotropicFiltering value="16" />
<MSAA value="0" />
<MSAAFragments value="0" />
<MSAAQuality value="0" />
<SamplingMode value="1" />
<TextureQuality value="0" />
<ParticleQuality value="0" />
<WaterQuality value="0" />
<GrassQuality value="0" />
<ShaderQuality value="0" />
<Shadow_SoftShadows value="0" />
<UltraShadows_Enabled value="false" />
<Shadow_ParticleShadows value="false" />
<Shadow_Distance value="0.000000" />
<Shadow_LongShadows value="false" />
<Shadow_SplitZStart value="0.000000" />
<Shadow_SplitZEnd value="0.000000" />
<Shadow_aircraftExpWeight value="0.000000" />
<Shadow_DisableScreenSizeCheck value="false" />
<Reflection_MipBlur value="false" />
<FXAA_Enabled value="false" />
<TXAA_Enabled value="false" />
<Lighting_FogVolumes value="false" />
<Shader_SSA value="false" />
<DX_Version value="1" />
<CityDensity value="-1.009000" />
<PedVarietyMultiplier value="-1.000000" />
<VehicleVarietyMultiplier value="-1.000100" />
<PostFX value="0" />
<DoF value="false" />
<HdStreamingInFlight value="true" />
<MaxLodScale value="-0.800000" />
<MotionBlurStrength value="0.000000" />
</graphics>
<system>
<numBytesPerReplayBlock value="9000000" />
<numReplayBlocks value="36" />
<maxSizeOfStreamingReplay value="1024" />
<maxFileStoreSize value="65536" />
</system>
<audio>
<Audio3d value="false" />
</audio>
<video>
<AdapterIndex value="0" />
<OutputIndex value="0" />
<ScreenWidth value="800" />
<ScreenHeight value="600" />
<RefreshRate value="60" />
<Windowed value="0" />
<VSync value="1" />
<Stereo value="0" />
<Convergence value="0.100000" />
<Separation value="1.000000" />
<PauseOnFocusLoss value="0" />
<AspectRatio value="5" />
</video>
<VideoCardDescription>AMD Radeon HD 6570 (AMD Radeon HD 6570)</VideoCardDescription>
</Settings>