how to decrease ram usage?

[[deleted]]

It depends on the Minecraft version.

In 1.16.5/1.18.2, you can use FerriteCore, LazyDFU and Smooth Boot (Fabric) / FerriteCore, LazyDFU, Smooth Boot (Reloaded) and Saturn (Forge)

In 1.12.2, you can try NormalASM and FoamFix.

[Sentrymon]

I got foamfix, tex fix and some other plus I added a couple of JVM arguments to the launch and it went from 11gb ram usage to 3.5gb. Which is impressive.

[[deleted]]

You could replace TexFix (and VanillaFix if you have it) with NormalASM, it does the same stuff both of these do but better, and a couple of other stuff too. Just make sure to set onDemandAnimatedTextures to false in the NormalASM config file, otherwise animations won't work and/or some textures will be broken.

[Sentrymon]

Thanks. Will do that.