Remove all

C# clientside mod which allows you to disable drawing of various things for suspense or fps if you have low-end gpu

Settings are available via commands:

ra

ra hide_level_objects	toggles level object filter
ra hide_entities	toggles item and structure filter
ra hide_particles	toggles particle filter
ra hide_lights	toggles item lights filter
ra hide_decals	toggles decal filter
ra water_particles	toggles water particles
ra ghost_characters	toggles second draw pass on characters, 1 time is faster but lights will shine throuh them
ra background_fishes	toggles background fishes
ra default	loads default preset, water particles and background stones are removed there because the eat unproportional amount of gpu
ra vanilla	loads vanilla preset
ra all	removes everything
ra darkmode	makes current config darker

ra_blacklist

ra hide commands toggles filters, which are filtering stuff with blacklists

ra_blacklist name	loads blacklist, there's just 2 for now: HideAll and HideNotImportantStuff, you can try making your own with scripts in JScripts folder

ra_config

low-level command which sets the real settings

ra_config LevelRenderer.WaterParticles.*	amount of particle layers in water
ra_config LevelRenderer.DrawWaterParticles	should the game draw water particles at all
ra_config LevelObjectManager.MaxVisibleLevelObjects	max amount of visible level objects on the map
ra_config LevelObjectManager.CutOffdepth	cut off depth for level objects
ra_config LevelObjectManager.RemoveDepth	makes game draw background stones on 0 depth (spoiler, useless)
ra_config LightManager.DrawHalo	should the game draw halos
ra_config LightManager.GhostCharacters	should the game draw characters twice
ra_config LightManager.HightlightItems	item highlighting
ra_config LightManager.DrawGapGlow	glowing in gaps
ra_config LightManager.HaloScale	halo size
ra_config LightManager.HaloBrightness	halo brightness
ra_config LightManager.HullAmbientBrightness	brightness of ambient light in hulls
ra_config LightManager.HullAmbientColor	color of ambient light in hulls
ra_config LightManager.GlobalLightBrightness	global multiplier for brightness of all light sources
ra_config LightManager.LevelAmbientBrightness	brightness of ambient light on the level
ra_config Submarine.CullInterval	min time interval between item culling
ra_config Submarine.CullMarginX	Width of offscreen culling gap
ra_config Submarine.CullMarginY	Heigth of offscreen culling gap
ra_config Submarine.CullMoveThreshold	min camera move threshold to trigger culling
ra_config Hide.Entities	should filter items and structures
ra_config Hide.ItemLights	should filter item lights
ra_config Hide.LevelObjects	should filter level objects
ra_config Hide.Particles	should filter particles
ra_config Hide.Decals	should filter decals
ra_config MaxBackgroundCreaturesCount	max amount of background fishes on the level
ra_config MaxParticles	particle count limit
ra_config Blacklist	attached blacklist

extra commands

light	non cheat version of of lighting
ra_exposure	size of showperf graph capture window in ticks

source code xml version

Also try reshade for more post processing effects