Been there, done that. Had like 3,000 sheep in a 1 chunk area... Fortunately (or unfortunately, your choice), had a Draconic sword... NEVER use it in what mob cluster... sever froze for like 20 min. before the xp orbs and drops. How the server, nor my client, did not crash, I will never know.Do you have CoFH Core installed? I think that needs to be there for RF to transfer properly. This was the case a while back, not sure if still the case.
386: Make an animal breeding machine
387: Give it infinite food, and leave it running in a loaded chunk on the server
388: Log back in to 1fps
389: After 10 minutes of waiting for the game to finally finish loading see yourself get banned from the server
390: Kill the Chaos Dragon with Wooden Shurikens.