Oculus is an unofficial Iris fork available for Forge and NeoForge on Minecraft 1.16.5–1.20.1. It retains Iris features and supports existing ShadersMod and OptiFine shader packs without modifications. Paired with optimization mods such as Rubidium, it should make fuller use of your graphics card.
Rent your own Minecraft server and install Oculus with one click from the panel to include this Iris fork in your mod setup.