Originally posted by Mharr:

This can be done by blanking the appropriate texture assets, these guys are working on it: https://www.nexusmods.com/valheim/mods/1467

Maybe, to get rid of it visually. But, as I guess, each action has own effect particles texture, how could I know correct action name for texture to get rid of hammer smash effect?

Issue with performance still be here. Replacing particle material textures with "empty texture" (all channels RGB+A black, fully transparent alpha) will make those puffs visually invisible, but actual particles still spawn.

Performance issues with such effects is in layering lots of translucent planes on top of each other so engine render opaque geometry end then rerender same pixel with translucent layer on top (multiple times if multiple translucent layers)... When such effect cower almost whole screen area then game has to render too much of such "heavy" pixels.

I work with Unreal Engine many years, I know what I say. Just because they will look fully transparent it will not help with performance loses issue.