Whole PC lags when opening a GUI
Whenever I open any GUI in game, a chest, settings, etc, my whole pc lags up. The game is otherwise running at a steady 100fps with no drops in performance. I've allocated 18G of ram but it's only using half of that. I'm also running ~150 mods but it doesn't seem to have an affect on it, as the lag occurs when just running Sodium and Iris.
It only occurs inside a game, not on the menu screen....
Bliss not compiling
I tried 3 versions of Bliss (a fork, modrinth, dev) yet it can't seem to work with distant horizon.
Distant Horizon ; 2.3.2b
Iris : 1.8.8
Sodium : 0.6.13...

PC FREEZE WHILE USING SHADERS WITH IRIIS
My PC randomly freeze and i can't do anything i just have to reboot my pc and this happen only when i set on the shaders. No matter wch shaders ii sued got the same issues. I used iris shaders till 2 years now and never seen thiis before. Ii tired everything but i can't play with shaders now... pls help me
Colored lighting bug when using BSL Shaders
Latest Iris (0.16.14) + Radeon drivers (25.6.1) + BSL v10. Only happens when block faces are not fully obscured. Lighting should be smooth and blend in. Does not happen on AMD Drivers older than 25.3.2.

Trying to make Rifts from "The Midnight" visible (and to learn about tweaking shaderpacks)
there is a mod called "The Midnight" which spawns little rifts at night time to take you to a special dimension, and similar rifts have a chance to spawn to let you escape that dimension once you are in there. but with any shader pack enabled they are completely invisible. i have deduced that its an entity, and that the problem is something to do with the rifts using "GL shaders" based on an old post i read in the discord of that mod. just trying to tweak my shaderpack or my settings or even mak...
Solution:
so the ctrl + G thing never did anything in my game but i did get it working so im just gonna leave this tutorial i made here incase anyone else comes across the same problem and ends up here looking - https://www.youtube.com/watch?v=3tEZ3pG96vk also @Rasgnarok this method could work for pixelmon too but i havent been able to try it out

Iris does not work with Sodium
I am using Sodium 0.6.13 and Iris 1.8.0 Beta (the issue on github uses 1.8.1) and it says that it's not compatible.
Pixelmon not rendering
All Pokemon within the Pixelmon mod (at least for the version on 1.21.1 neoforge) are invisible when using the Iris mod, not just with shaders active but having the mod running at all.
Break Block Particles Invisible
While I'm using Shader it removes Breaking Block Particles completely, i also tried other shaders, I can see break particles if I'm in Third Person or if i disable the Shaders.
Solution:
Okay i fixed by using Modrinth version of a mod, it was mod called "Hold my Items" i used curseforge versions, guess modrinth had better versions
Water is buggy
(the first 2 images are complementary shader and the 3. is mellow shader)
every shader has issues with this line around me while complementary the only one is where the water is invisible
does any one know what the problem could be?...
Solution:
This was a driver issue

Iris crashing minecraft with exit code 1 on mac?
Whenever i enable iris, it just crashes my game, and the launcher gives me a exit code that says "1" (im on macos)
Holes in held items
Most items held are having this odd issue where strips or chunks of pixels are missing. Uninstalling Iris fixes the issue. Mod list is also attached, thanks!
Solution:
Didn't take that long in fairness- it was Effective and Iris as I said haha

All Iris 1.21.1 NeoForge Builds & GeckoLib Dependant mods are incompatable.
So, there is a issue with Iris causing Geckolib depending mods to fail to render there animations for some reason, the start of the error is as follows:
[31May2025 13:51:28.422] [Render thread/INFO] [STDERR/]: [java.lang.Throwable:printStackTrace:651]: java.lang.RuntimeException: creeperoverhaul:animations/creeper.animation.json: Unable to find animation file.
This is a example message of this issue, the full collective message can be seen in the .txt document provided as it's too big to post here manually.
This happens with literally all mobs depending on GeckoLib to function no matter what,...
Problem with Pixelmon Mod
Hello, good evening, this message is because I need help with a issue. I am creating a Pixelmon server neoforge with iris mod, but when I enter all the pokemons are like invisible, I only see the names floating (I have a image if needed). If I take out all the mods on mods file in .Minecraft, and only add Pixelmon mod I see the pokemons normally. Meanwhile, when I add Iris and Sodium, the pokemons became invisible again. My question is, ¿Is there a solution for that? I really want Iris in my world, I love it. I don't want it to delete it from my world. Sorry for the problems.
Note: The problem also occurs in my singleplayer world....

Need help with a world hosting issue
Hi, I've been putting together a modpack to play with my boyfriend, and we both get a connection error when trying to play together. It doesn't seem to matter what mod or method we use to play multiplayer, the error stays the same. My shaders is the only thing I can think of that would give us this message? Can anyone help?

Error Code 1
Im getting an error code 1 every time i try to use iris. It used to work before but now its stopped
Weird Stuttering
Hi, I'm experiencing some stuttering on some.. weird cases if I have to say. I'm running Fabulously Optimized 8.0.0 with the latest Complementary Shaders - Reimagined.
The issue is, occasionally, on the Minecraft window, (not the OS but the game window panel) it'd stutters but when I catching the game with OBS game capture or recording the game in general. The game runs fine in the recording but stutters like hell in the Minecraft window panel.
I don't think this is an Iris-related problem but I think this is the only place I can, at the very least, get some clues to fix this issue.
Video: https://streamable.com/a3pvjv...
Solution:
Error message when loading shaders
I got this error message when loading photon shaders onto java minecraft No more available texture units while activating sampler shadowcolor0
crashing after minutes or hours of gameplay
I'm playing on a realm with a few friends, and I have a clientside modpack for minimap and shaders. In the middle of playing I'll randomly crash and the error it throws is "java.lang.NullPointerException: Cannot invoke "com.mojang.blaze3d.vertex.MeshData.drawState()" because "meshData" is null". I'm using ComplementaryShadersReimagined and it is up to date
my nether and chunks far from my base reseted using iris
i don't know the reason why, but i took a 2 week break from minecraft and when i came back, my creeper farm, that was set in the ocean far from my base just disappeared. i didn't understand it at the beggining, so i went to the nether to check if it was ok. then, i saw that i had lost everything i placed in the nether as well. I don't know why this happened, and i am asking for help here. even my end portal was reseted and now i have to place the eyes again.