This mod just tune the "DefaultEngine.ini" of the Unreal Engine 4 to make a very hight settings. The game run fine on a AMD ryzen 3700X + Nvidia GTX 1070ti.
It's possible de edit the file to increase or decrease the settings.
The tests has been made on an Ubuntu Linux 20.04, the game maybe run a little faster on Windows.

This mod has been based on the no texture pop-in mod :
https://www.nexusmods.com/trialsofmana/mods/17

but extend parameters based on :
https://www.naguide.com/trials-of-mana-improve-visuals-and-tweak-settings/
https://docs.unrealengine.com/en-US/Engine/Performance/Scalability/ScalabilityReference/index.html

Here is the detail of the modifications.

# improving audio quality ( from 64 to 256 )
[Audio]
MaxChannels=256

# upscale
[ConsoleVariables]
r.ScreenPercentage=125

[SystemSettings]
# anti aliasing ( 6 = max )
r.PostProcessAAQuality=6
r.TemporalAACurrentFrameWeight=0.2
r.TemporalAASamples=2

# shadow
r.ShadowQuality=5
r.Shadow.CSM.MaxCascades=16
r.Shadow.RadiusThreshold=0.03
r.Shadow.RadiusThresholdRSM=0.03
r.Shadow.TexelsPerPixel=10
r.Shadow.MaxResolution=4096
# (amount of shadow cast )
r.Shadow.SpotLightTransitionScale=4096

# foliage density et depth of field
foliage.DensityScale=7
grass.DensityScale=7
foliage.LODDistanceScale=20

# models depth of field  ( 20x the normal distance 1.0 by default )
r.ViewDistanceScale=20

# anysotropic filter
r.MaxAnisotropy=16
r.Streaming.PoolSize=1000

# PostProcessQuality
r.BlurGBuffer=-1
r.AmbientOcclusionLevels=3
r.AmbientOcclusionRadiusScale=1
r.DepthOfFieldQuality=2
r.RenderTargetPoolMin=400
r.LensFlareQuality=2
r.SceneColorFringeQuality=1
r.EyeAdaptationQuality=2
r.BloomQuality=5
r.FastBlurThreshold=7
r.Upscale.Quality=3
r.Tonemapper.GrainQuantization=1

# light shaft
r.LightShafts=3
r.LightShaftQuality=3
r.DefaultFeature.LightShafts=3

# texture loading during loadscreen only, no longer loads during gameplay
r.Streaming.FullyLoadUsedTextures=1
r.Streaming.HLODStrategy=2

# memory video available for textures
r.Streaming.PoolSize=4096

# models LOD
r.StaticMeshLODDistanceScale=0.25
r.SkeletalMeshLODBias=-2

# increase view distance
r.ViewDistanceScale=10

# effect quality
r.RefractionQuality=2
r.SSR.Quality=4
r.SceneColorFormat=4
r.DetailMode=2
r.TranslucencyVolumeBlur=1
r.MaterialQualityLevel=1

# disable chromatic aberration
r.SceneColorFringe.Max=0
r.SceneColorFringeQuality=0

# depth of field quality ( max = 4 )
r.DepthOfFieldQuality=4