Unreal Engine 5 games can be highly customizable through launch commands, which allow players to adjust graphics, memory usage, and performance.

I decided to list the commands instead of providing examples and use cases. Steam launch commands have a character limit, so most of my examples exceeded that limit. If you'd like me to re-add the ones for low-end or balanced setups, let me know.

Steam Launch Options:
- Open your game library in Steam.
- Right-click your game and select Properties.
- In the Launch Options field, paste the commands:

-gc.Interval=60 -r.Streaming.PoolSize=1500 -FPS=60


Windows Shortcut Method:
- Right-click on your game executable or shortcut.
- Select Properties.
- In the Target field, add the commands after the executable path. For example:

"C:\Path\To\Game\MyGame.exe" -gc.Interval=60 -r.Streaming.PoolSize=1500 -FPS=60


Note:
The < and > symbols are not part of the command. They are used to indicate a range of acceptable values, and where a value should be inserted.
For example:
-gc.Interval=<30-60>
Means you should replace <30-60> with a specific number, such as:
-gc.Interval=45.

Garbage Collection Commands:

-gc.Interval=<30-60> (e.g., 45)
-gc.MaxMemoryAllowance=<256-4096> (e.g., 1024)
-gc.NumRetriesBeforeForcingGC=<1-5> (e.g., 2)
-gc.AllowParallelGC
-gc.MaxObjectsNotConsideredByGC=<100-500> (e.g., 300)


Rendering and Texture Quality Commands:

-r.Streaming.PoolSize=<512-8192> (e.g., 1500)
-r.ParticleLODBias=<0-2> (e.g., 1)
-r.DistanceFieldShadowing=<0 or 1>
-r.TextureStreaming=<0 or 1>
-r.ScreenPercentage=<50-100> (e.g., 67)
-r.ViewDistanceScale=<1-3> (e.g., 2)
-r.EffectsQuality=<0-2> (e.g., 1)
-r.PostProcessQuality=<0-2> (e.g., 1)
-r.FoliageQuality=<0-2> (e.g., 1)
-r.AmbientOcclusionLevels=<0-2> (e.g., 1)
-r.ShadowQuality=<0-2> (e.g., 1)
-r.ReflectionEnvironment=<0 or 1>
-r.LightingQuality=<0-2> (e.g., 1)
-r.TextureQuality=<0-2> (e.g., 1)
-r.Shadow.DistanceScale=<1-2> (e.g., 1)
-r.MaxAnisotropy=<1-16> (e.g., 8)
-r.TranslucencyVolumeBlur=0
-r.Lumen.Reflections=<0 or 1>
-r.Lumen.GlobalIllumination=<0 or 1>
-r.RayTracing=<0 or 1>
-r.SceneColorFringeQuality=<0 or 1>
-r.MaterialQualityLevel=<0-2> (e.g., 1)
-r.TemporalAACurrentFrameWeight=<0-1> (e.g., 0.2)
-r.TemporalAASamples=<1-8> (e.g., 4)
-r.MipMapLODBias=<0-4> (e.g., 1)
-r.HZBOcclusion=<0 or 1>
-r.DOFQuality=<0-2> (e.g., 1)
-r.CustomDepth=<0 or 1>


DLSS Commands:

-r.NGX.DLSS.Enable=1
-r.NGX.DLSS.Quality=<0-3> (e.g., 2)
-r.NGX.DLSS.Sharpness=<0-1> (e.g., 0.5)


Performance and Scalability Commands:

-UseDynamicResolution
-ForceCPUScalabilityMode=<0-3> (e.g., 2)
-FPS=<30-240> (e.g., 60)
-r.ForceLOD=<0-5> (e.g., 2)
-AudioQualityLevel=<0-2> (e.g., 1)
-UseAudioThread=1
-net.MaxClientRate=<5000-100000> (e.g., 20000)
-net.MaxInternetClientRate=<5000-100000> (e.g., 20000)
-cpupriority=<0-5> (e.g., 2)
-t.MaxFPS=<30-240> (e.g., 60)


Visual Effects and Post-Processing Commands:

-r.DefaultFeature.AntiAliasing=<0-2> (e.g., 0)
-r.DefaultFeature.MotionBlur=<0 or 1>
-r.DefaultFeature.LensFlare=<0 or 1>
-r.DefaultFeature.Bloom=<0 or 1>


Debugging and Logging Commands:

-LogCmds=logfile.log
-StatUnitGraph
-ProfileGPU
-ProfileGame
-DebugExecBindings


Other Commands:

-EnableHighDPI=1
-UseVSync=<0 or 1>