This is a performance problem report. I tried to capture the performance issue, but the nature of it makes it difficult to do so.
What did you do? - Played the game on a map with a huge amount of trees.
What happened? - The game stuttered/flinched/froze-for-an-instant corresponding in a frequency to the tick update setting of the Treeees mod. It is practically clockwork.
What did you expect? - I expected this mod to not stutter gameplay.
Disabling the Treeees mod makes the stutter go away.