If you have a problem with the pack crashing, or just running poorly, then do the following:
- Make sure you're running 64bit Java. https://www.java.com/en/download/manual.jsp
- Make sure you have a 64bit launcher.
- Make sure you have allowed the game at least 3gb of RAM (https://tinyurl.com/ya3m98vo)
- If previous methods didn't work, try to reinstall.
If the problem persists, contact me, or any other ZFG developer on discord. We're all glad to help.