Yesterday my local server suddenly got huge tick lag. Whenever I place or remove a block, try to open an inventory, eat, etc I need to wait a couple of seconds before the server catches up.

By now, I've finally found the problem. There is a part of my itemduct network that has about 10.000 leaves in an infinite loop, and I don't know how to get them out without crashing Minecraft.

I initially tried breaking a block in the loop, this caused all leaves to spill out and left me with less than 1 FPS. I had to stop it because it just kept getting slower.

Second thing I tried was attaching an inventory to the network and setting a connected itemduct to vacuum. Didn't work, the leaves are still in the network.

Right now, I don't know what else to do. How do I get them out?