The Ring of Magnetism doesnt appear to have a limit to the number of items it will 'hold'. In some cases this results in minecraft being completely unusable (cant open inventory, close minecraft, etc).

I currently have a mana generation build using the magic bees Beegonia, and as far as I can tell a endermini and creeper had a discussion around the full pool detection redstone. So entering the area suddenly pulled probably upward of 4k bees onto my ring and rendered my client unusable. It should be noted that this effect doesnt appear to impact cpu usage significantly (its sitting at 24% for MC) but its renders it impossible to use inventory, open an apiary, deposit bees back into their cache or even leave the area with a teleporter/elevator.

Image of at least 4k bees sitting on my magnet ring.