Ya, there isn't much we can do to help you. Optifine is a thing that just hacks into A LOT of internal stuff. And we've tried to expose as much as we can to help him. But he's closed source, and doesn't talk or submit issues. So ya, can't do anything.
Plus the fact that MOST users don't get any performance out of Optifine. Oh well.
Make your choice, Optifine or Forge. We've done our best.