Once Ephyrium Shaders is inside your game's shaderpacks folder and you are running a shader loader such as Iris or OptiFine, you can turn it on directly from the pause menu without restarting Minecraft.
Selecting the Shader Pack
1. Load into a world or stay on the title screen, then open Options and click Video Settings.
2. Open the Shaders (or Shader Packs) menu.
3.
4. Step outside in your world to verify that daytime skies look semi-realistic and terrain, water surfaces, and nearby builds now cast detailed shadows.
Choosing Between Medium and High Profiles
Ephyrium Shaders includes built-in profile options tailored for medium and high hardware setups.
1. Return to the Shaders screen and open the Shader Pack Settings button.
2. Locate the profile selector at the top of the settings screen.
3. Pick the Medium profile if you want smoother frame rates during general survival play, or switch to the High profile if your graphics card has spare headroom and you want fuller shadow and lighting detail.
4. Click Done to return to your world and check your frame rate while moving across open landscapes.