Optifine is ok.
Here you go, please look around the forums first before making a thread next time, he have a thread called Rules on the main page of the forums.
http://www.minecraftsurvivalgames.com/threads/mcsg-updated-rules-version-3-0.12254/
2. No Hacked or Modded clients are allowed EVER: Mods that give unfair advantages are not allowed.
- Any suspicion of using a client can earn a temp ban or a permanent ban depending on the situation. Even discussing hacked clients on our servers is worthy of a tempban.
- Anything outside of a vanilla client that provides an unfair advantage (x-ray, minimap, radars, force fields, speedhacking, better sprint mod, ect.) is considered a modded or hacked client!
- A detailed list of the mods we do not allow will be provided.
- If you use mods to increase your FPS or textures like the watermod, it's OK! We just don't like the ones where you modify your character's performance.
- If you are caught or the administration has suspicion of you using hacks, your ranking and leaderboard scores are subject to be reset to the defaults.
- Admitting to using a modded/hacked client, even jokingly, will result in a ban
- Using the macros mod to bind your sprint so you do not have to double press “w” to sprint is not allowed.
- If you are unsure if a certain mod is allowed or not, as a staff member before using it.
- This includes modifying files in your .minecraft to give a advantage such as increasing the gamma to give effect of full bright.
- Binding macros to give you the ability to sprint without tapping W twice is considered hacking and will be dealt as such.
Allowed Mods list:
- Optifine
- Shaders Mod or "GLSL Shaders"
- Toomanyitems
- Armorstatus
- Directionhub
- Multiplayer profiles mod
- Macros Mod [only for staff since normal members can use it to break rules]
- Camera Studio
- Animated Players Mod
This list will update over time.
Any mods not posted on the mods list should be verified with staff before using.
Thread Locked.
Have a nice day.