For the sake of permission, OptiFine is not featured in this mod pack but I highly recommend installing it for a performance boost. OptiFine can be downloaded at http://optifine.net, and once downloaded simply add it to the 'mods' folder found in .technic/modpacks/science-forge/mods/
If you run into any performance issues, try disabling mipmaps and decreasing the render distance - 1.7 Minecraft sends textures in a single pipeline which hits quite hard when a lot of mods are installed.