Why does Houdini's UI/Viewport feel laggy now when the IPR is running? It literally was fine in 2025.4.0.0, and now I am getting 15 fps in the viewport with nothing but a CUBE in the scene.

Why does Houdini's UI/Viewport feel laggy when the IPR is running? It feels like a 2019 version of Octane Plug-in, are we regressing?
This genuinely ruined my day.

I noticed that switching "subsampling" for the IPR often crashes the engine!

Just noticed that you have "media" tab in the search bar instead of "medium" for mediums lol.

Neural Radiance Cache is just awesome!

May I ask to make the "Zoom Perspective" icon sticky in the IPR like "Disable DOF? Because it gets reset every time I reload IPR or press "Reset Perspective", it gets tiring clicking on it every time I wanna zoom in.

Hey everyone,

Copying Octane_Lights results in a bunch of errors saying parameters don't exist etc. Could you take a look at it? Octane Lights specifically not Universal Lights. Also opening HIP files with these Octane Lights also raises some errors all the time. They seem to work fine though!

I haven't tried this build yet, but was the octane lights (not universal lights) crashing octane issue was addressed?
And yeah turning the flags off for lights doesn't seem to trigger the IPR!

Thanks a lot for the release!
I already reported this bug via a support ticket, but will drop it here too:
Volume Motion Blur doesn't work with Standard Volume Shader.
I am waiting on this fix, it's much needed. I hope for the next build if possible

I have another crash bug to report:

The constant crash that I've just found, is somehow related to the Octane Lights (not the Universal Lights though), I am rendering to disk and after the first frame is rendered houdini crashes, you can check this hipfile I've made to reproduce the crash ...