OptiFine is a Minecraft optimization mod that adds support for shaders and improves the game's performance. You can download OptiFine from its official website, https://optifine.net/downloads.
Now start Minecraft and select the OptiFine profile from the launcher.
There are many shaders available, and you can find them on sites like Shader Packs or CurseForge.
You can find it by going to the "Options" menu in the Minecraft launcher and selecting "Resource Packs," then clicking "Open resource pack folder." In the folder that opens, go up one level to the ".minecraft" folder.
Create a new folder called "shaderpacks" in the ".minecraft" folder.
Move the shader pack you downloaded in Step 3 into the "shaderpacks" folder.
Launch Minecraft and go to "Options," then "Video Settings," then "Shaders." You should see the shader pack you downloaded in the list of available shaders. Select it and click "Done."
Note that some shaders may require additional configuration or may not work on all systems, so be sure to read the documentation that comes with the shader pack.
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