Hello, this is my first post on my own, so please don't make fun of me.
So I want to use optifine on my Macbook air, but the only 1.8 version I can find is the ultra version. And no, don't tell me to not use a mac, and no, don't say use 1.7.10, I am playing a modded 1.8 survival, and I don't want to make a new world. All I am wondering is if I could use optifine on my computer.
You should have no issues running Optifine, just get the most recent Forge for your version and you're good to go. Also if you're having fps trouble you could try adding BetterFPS, to supports up to 1.8.9 and gives a decent boost to overall performance.