Read then remove this section:

Should note the https://vazkii.us/br101 link in the template gives a 404

Bonsai Trees version: 1.1.1-b138
Forge version: 14.23.4.2768
I am not using Optifine: No Optifine, but do have FoamFix
Link to Crashlog: No crash
Screenshot (if possible): here - screenshot is the lag from on top of an Iron Chest or a vanilla chest using LagGoggles

Description of the problem including expected versus actual behavior: Hopping Bonsai works as expected, creating the tree and dropping drops. However, after the chest gets full the bonsai hopper becomes -very- laggy. I do normally use chests from the Iron Chest mod, and they're very laggy, but even on vanilla chests they're still a source of lag. Uncertain if this is an Iron Chest issue or if there's a preferred method for this. For what it's worth, changing B:waitForEmptyItemBuffers to true in the server config didn't seem to make a difference, so I think that means the lag isn't directly linked to voiding or not voiding

Steps to reproduce: Place Bonsai Hopper on top of chest. Fill chest with assorted junk or let hopper fill the chest on it's own. Plant tree and wait for it to fill completely

This is actually a vanilla Hopper issue. You can reproduce the same effects by pointing a hopper into a full inventory and filling the hopper with multiple different types of item stacks.

So, to prevent this from happening I'd have to have a mechanism to void anything that can't fit in the chest separate from what Bonsai uses?

Sadly yes, either you separate em out from the main inventory that the hopper is located, or use something like storage drawers where you can just slap on a void upgrade.

@Darkere Did you test if your change somehow actually reduces the ridiculous lag?

Edit: Just compiled myself, fixed. Thank you!