When ever I launch Minecraft, every time I look around, it lags, I installed Optifine and I set all the graphics to fast and stuff.. yet, it still lags when I look around, but when I move around without looking around it doesn't lag, any ideas, tips, or suggestions?
If your computer still lags despite minimal settings, then I think it's time for you to get a new computer with better graphics and RAM, because Optifine is meant to reduce that kind of lag.
I had this exact same problem on my Windows Xp computer. I found out that it was a malware program called STIJ.EXE. Go to task manager, then proccesses and click End Proccess. This will only quit it for a couple seconds though. If you want to delete the malware completely and restore your computer bakc to it's original glory, download SpyHunter. It will do a scan and delete STIJ. Enjoy lag free Minecraft.
Press F8 on your computer, it should stop it.
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