AutoHUD auto-hiding is stuttering when Exordium is enabled. The reason seems quite obvious - because the FPS is lowered, but I think that mod should have an exception for that.

This is currently the intended behavior. Something for later to look into, but not a priority right now.

Author of AutoHUD here. I forgot if we talked about this before, but if you provided a way for other mods to signal Exordium to temporarily pause buffering (potentially per feature, so everything else still gets the performance bonus?), I would love to send those signals whenever AutoHUD's animations start/end.

That is planned, but I also want to rewrite significant parts of this mod to for example keep each hud part separated(only re-render the chat if anything changes in the chat, etc, with an fps cap for constantly animated things like F3/enchanted items). Together with settings on which part of the UI should be "cached", this should help mod compatibility.
I will add an API as I did on my other mods(3d skin layers, entity culling, item swapper, first-person mod, wavey-capes), but I'm currently kinda wandering from mod to mod and majorly improving it(first wavey-capes, currently entity culling), while also developing item swapper. I guess it's time to pick this mod next after I released all the updated versions of entity culling.

Note: That sounds more like screen buffering. Make sure to turn that off(it has been removed in 1.19.3 too).

Ah I just was about to make an issue regarding Journeymap! the map stutters as well when opening up, tested multiple times to confirm that journey is the culprit

Author of AutoHUD here. I forgot if we talked about this before, but if you provided a way for other mods to signal Exordium to temporarily pause buffering (potentially per feature, so everything else still gets the performance bonus?), I would love to send those signals whenever AutoHUD's animations start/end.

Using my modpack (Better Adventures++ on Modrinth) which includes AutoHUD, adding Exordium causes the hotbar and items to be invisible. Is this a known issue?

Using my modpack (Better Adventures++ on Modrinth) which includes AutoHUD, adding Exordium causes the hotbar and items to be invisible. Is this a known issue?

Please just don't add this mod to random Modpacks. Right now it's designed for vanilla-ish gameplay. You might be able to work around this by disabling all the hotbar stuff getting buffered at all, but that's just a workaround.

Using my modpack (Better Adventures++ on Modrinth) which includes AutoHUD, adding Exordium causes the hotbar and items to be invisible. Is this a known issue?

Please just don't add this mod to random Modpacks. Right now it's designed for vanilla-ish gameplay. You might be able to work around this by disabling all the hotbar stuff getting buffered at all, but that's just a workaround.

That's the thing, my pack is designed to be a vanilla-ish pack. There's very few content mods, and what IS added fits the vanilla style. Not to mention the same issue is ran into with JUST AutoHUD, Sodium, and Exordium on a fresh 1.20.1 instance. I wanted to add the mod because it could benefit people on lower end systems who want to play.

Looks like disabling the hotbar buffering worked, but as you said that's just a workaround