The filler seems to be filling fine, when it has enough blocks. However once it has no more blocks left, it throws a fit and lags down the entire server.

With filler running, no blocks available:

After placing blocks in the filler:

It's a weird issue for sure, but the filler appears to be the source of lag, since as soon as it received blocks to continue its job, the server returned to normal.

Trickier to fix than I wanted it to be.

@crescentrose Could you try with http://asie.pl/bc645c.jar ?

I tried this latest fix on my sever and still ended up with very large delays when the builder runs out of blocks. It's almost like it's in a race condition looking for blocks. If needed, I can provide a snapshot of my server.

Average tick got as high as 1300ms

That would be appreciated

@Goobaroo - ping?

https://dl.dropboxusercontent.com/u/34742192/HermitcraftModsauce_1011.tgz

The builder is setup in the overworld above ground near the spawn point for the world. It's quite a large pattern.

Sorry, took some time to get it together.