you need this to avoid (most of the) problems playing on my server
minecraft folder link: http://www.mediafire.com/#ibrbsyskfbba0
1. delete everything inside your .minecraft folder (if you want to save anything make copies of it and put it in a folder somewhere)
2. extract the rar inside your .minecraft folder
3. launch game
4. log in
5. Edit Profile > Use version > "release 1.6.2-Forge9.10.1.859"
5.5 check "JVM Arguments and increase the Allotted ram (-Xmx4G or -Xmx6G or -Xmx8G) for better gameplay"
4 = 4Gb ram, 6 = 6Gb ram, 8 = 8Gb and so on and so forth
6. Save profile
7. Play!
Optional:
8. you can turn down your graphics via options > video options > and adjust them accordingly (like put eevrything to fast, reduce draw distance, details n stuff
enjoy~