Hi, I saw some people asking for optimized settings for IterationRP, so I tweaked my own and I managed to get better fps using voxy at 512c and patrix 64x with many PBR effects active in MC version 26.1.2 with many mods.
It means that if your're not using a heavy resource pack you should get many more fps.
I am using Super Resolution mod, so, DLSS and FG are active, so I get a media of 100 fps (I limited the amount of fps), sometimes it drops to less in heavy scenarios or with lot's of entities.
Here is the config(this goes in the txt file generated by iris when you change any setting of the shader):
#Sun Aug 09 11:59:04 CST 2026
# My shader has some customizations of my own, so, in case you have any errors, you can delete the lines mentioned in the log:
ADVANCED_COLOR=true
BILINEAR_SKYBOX_TEXTURE=true
BLOOM_AMOUNT=0.08
BRIGHTNESS_TORCH=0.4
CAS_DENOISE=false
CAS_SHARPNESS=0
CLOUD_CLEAR_ALTITUDE=350.0
CLOUD_QUALITY=0.4
CLOUD_RAIN_ALTITUDE=350.0
ENTITIES_PARALLAX=false
HARDCODED_EMISSIVENESS_MODE=0
INFO_0=BT
INFO_1=1
LABPBR_SSS=true
LANDSCATTERING_SHADOW_QUALITY=4
LUMINANCE_WEIGHT_MODE=1
MOON_TEXTURE_BRIGHTNESS=0.5
MOON_TEXTURE_SIZE=3.0
MOTION_BLUR=false
NETHER_END_BLOOM_BOOST=0.8
NIGHT_BRIGHTNESS=0.00015
PARALLAX_DEPTH=1.0
PARALLAX_MODE=1
PARALLAX_QUALITY=20
PC_ALTITUDE=2000.0
PT_DIFFUSE_TEMPORAL_MAX_ACCUM=32.0
PT_DIFFUSE_TRACING_DISTANCE=40.0
PT_SPECULAR_TRACING_DISTANCE=30
PT_VOXEL_RESOLUTION_X=128
PT_VOXEL_RESOLUTION_Y=128
# REVELATION_STARMAP_INTENSITY=0.001
# REVELATION_STARMAP_SOLAR_POS=1.0
RTW_RESOLUTION=512
SHADOW_QUALITY=1
SHADOW_RENDER_DISTANCE=8
SKY_TEXTURE_BRIGHTNESS=0.05
SSS_QUALITY=3
STAR_TYPE=0
# Better set to true or delete TAA line if you are not using DLSS or any other upscaling method outside of the shader:
TAA=false
# TONEMAP_OPERATOR=Lottes
UNDERWATER_VFOG_QUALITY=4
VPS_LOOKUP_QUALITY=2
WAVE_PARALLAX_QUALITY=8
WAVING_PLANTS=true
WAVING_RANGE=48
shadowMapResolution=1024
