Using leads attached to a fence that separate trader lamas a far enough distance so that they constantly attempt to re-join each other's company causes a severe penalty to TPS. My experience resulted in approximately 10ms increase of average for each pair of lamas.

Separating the lamas using a fence cage does not have a performance impact.

Steps to recreate:

1) Steal a pair of trader lamas

2) Separate the lamas using leads on fence posts. Make sure they are far enough away that they try to re-join each other's company.

3) Compare TPS in Alt-F3