Build Command Brings FPS close to 0, unable to build

## Some information
Operating system: Windows 10
Java version: 11.0.2
Minecraft version:1.12.2
Baritone version:1.2.9

## How to reproduce
No Clue, just happens when i use .b build.
I'm using 1.12.2 but it still lags the shit out of my pc, lower than 1 fps.
using an r5 2600x and a 1060 6gb, so its not my pc.
Trying to build a pretty big schematic, only uses one block though.
Cpu load isnt at 100%, neither with my gpu.

## Final checklist
- [x] I have included the version of Minecraft I'm running, baritone's version and forge mods (if used).
- [x] I have included logs, exceptions and / or steps to reproduce the issue.
- [x] I have not used any OwO's or UwU's in this issue.