Update: I have lag now, I fixed the crash.
FTB Launcher version (if this isn't the newest update and try again):MultiMC
Minecraft Version:1.2.5
Java version:7
Detailed description of the issue / how can the issue be recreated: When playing the map i have extreme lag and the entity counter shows over 4000 entities. i am unable to easily find the cause of all these entities and i really want to play it.
Error logs:N/A