ActuallyUsefulMods VS Capes

I'm in no way an expert either, but let me firstly link to this Github page: ActuallyUsefulMods. It's a list of all the performance mods available.

i use a worse pc and I'm fine lol just use 6 to 5 gb ram allocated and add some performance mods https://github.com/Radplay/ActuallyUsefulMods click on the version you want and have a look its very useful have a nice time with mods

Also, here's a list of performance mods. Click the link for your version/loader and install some of those if you haven't already. If you decide to play on Forge, ModernFix is another massively helpful mod that isn't listed there.

Here's a list of all 1.16.5 performance mods: https://github.com/Radplay/ActuallyUsefulMods/blob/main/Performance/Performance116.md - I would highly recommend installing as many of these as possible. If you're using the OptiFine mod, get rid of it and use Rubidium instead.

Better performance mods - https://github.com/Radplay/ActuallyUsefulMods

Sadly no. BUT there is a client side mod called capes which let's players have custom capes but you have to have the mod to see other players custom capes

After a quick search I found this mod called Fabric Capes, which might be what they're talking about

Fabric Capes (by VictorKohler)

You can install Kappa or Fabric Capes alongside sodium/iris for optifine capes

You can replace all of Optifine's features with the right Fabric mods, like Continuity, CEM, Animatica, FabricCapes, and Iris. I don't know all the features Optifine has, but every important feature Optifine has that I can think of has a Fabric mod counterpart.

Well, there is the Fabric Capes mod, it shows capes from OptiFine and a whole bunch of other mods

you can get to see your capes in fabric, just add this mod https://www.curseforge.com/minecraft/mc-mods/capes :)