Mob avoidance causing Lag and crashes.

## Some information
Operating system: Manjaro Linux, forgot version as well as Windows 10
Java version: 8
Minecraft version: 1.12.2
Baritone version: Impact 4.6

## Exception, error or logs
Running out of memory

## How to reproduce
Set mob avoidance to a moderate value.
Get in an environment with many mobs, specifically withers.
Toggle avoidance to true.
Find a longer path about 2500 blocks away.

## 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.(except this one)