To use it with Forge, just drop the downloaded file into your /mods folder.
Glad I could help you get set up with OptiFine 1.19.1! It makes a massive difference for performance and shaders in Minecraft. Thanks for downloading Optifine 1.19.1
You might need to click "Preview Versions" on the official OptiFine download page to find the 1.19.1 release. To use it with Forge, just drop the
If you are looking to get the best performance, here are some key takeaways from the community: To use it with Forge