I think most of Minecraft players use OptiFine because it makes Minecraft Experience better without lag!
But, some people are complaining that OptiFine Forge Lags SO HARD!
Well...I have a solution...
You don't even have to have Forge to use OptiFine...
To use OptiFine without Forge and without any lag, just go to this website: http://optifine.net/home

Then, click the Downloads button, and select the version of Minecraft you wanna use!
Then, just simply download it and DONT PUT IT IN MODS FOLDER!

Now just open it...a little window will appear and you just have to install OptiFine...
When it seas it's downloaded, you just open Minecraft Launcher and select OptiFine version!
Then click the Play button and Enjoy!