What happened?

When I use iris+sodium I experience framerate drops underwater, or near buildings with water in them (where you can look up to the sky while standing below the top i.e. Fish tanks in homes.

BSL, Complementary, and Sildurs do not seem to replicate this issue. I will assume its possibly just due to SEUS code being a pain and nothing more; however, if there is an issue within iris then I want to make this issue known.

Screenshots

Relevant log output

No response

Minecraft Version

1.18

Iris Version

iris-mc1.18.1-1.1.3.jar

Sodium Version

sodium-fabric-mc1.18-0.4.0-alpha5+build.9

Operating System

Windows 10

What is your GPU?

Nvidia GTX 1660

Java Version

Java 8 (JAVA_17 according to logs)

Additional context

No response

For some reason the images didnt show framerates. Top image was at 40FPS, the other two were at 60FPS (capped to 60 to conserve some energy on my GPU)

I think it's unlikely that this is an Iris issue as opposed to a SEUS problem (and one that we can't really do anything about at that).

Well has the problem been reported before? or is it a new one that popped up?

I haven't seen the problem before, but it's worth testing on OptiFine to see if you see similar results. Iris doesn't have much control over the effects the shader pack implements and it's likely that SEUS is implementing some slow underwater effects that lower your FPS.

on optifine the issue doesnt exist. Though seeing how SEUS' underwater effects are buggy on iris ill assume its something that optifine utilizes to do underwater stuff that iris currently does not.

Seems the latest 1.18 build of iris (build failed on my end but made a prenull.jar that worked?) that was made 1 hour ago, fixed the frame drops.

Good to know that it's fixed in development, I'll admit that I don't know what we committed that would fix that.

unsure either lol. If it pops up again ill be sure to mention it.