Random frame rate drop

[Legominecrafter]

Launcher Version: 242

Operating System: Mac OSX 10.7.5

Java Version: Java 7

Antivirus Program: None

Description of Problem:

I usually get a steady 60 frame per second when using any of the technic launcher modpacks. One day I was trying to launch Voltz, it asked me to update after I had recently updated it to 1.1.4. Thinking this message was a glitch I allowed it to update. When I created a single player world my frame rate dropped to about 25-40. This happens on every modpack I use. I have tried allocating more RAM, increasing the PermGen size and changing render distance. Nothing helps, any help would be appreciated.

Error Messages:

There is no error message.

Error Log:

There is a log but I don't think it's an error log.  I will post it later if needed

[sebrro1]

Hello what texture pack are you using I found using the hd ones cause low frame rate, Sphax etc and other hd texture packs cause this try using default one and look at the frame rate, I have a imac 32gb 2gb graphic I usually get 120 fps but drop to 40-50 as I use a texture pack