The reason sometimes this happens:

1. Geoscape very slow
2. Slow Black Market loading
3. Slow switching between Soldiers in the Armory
4. probably other...

is not specifically the fault of this great mod but it is a generalized problem of Mods conflicts between specific mods and it happens EVERY TIME that 2 Mods are trying to override the same class. This Mod overrides 2 classes:

1. XComTacticalInput
2. X2Camera_FollowMouseCursor

The game will work for you at aperfectly good framerate UNTILL you unintentionally make the mistake of installing another Mod that overrides one or those 2 same classes. Deactivating this or the new mod will immediately solve the problem.

If you want to know which mods have class conflicts simply select the folder where XCOM2 saves all the Mods (in my case Folder 268500 on my Mac) and make a simple file search of "ModClassOverrides=(BaseGameClass=" and check in the results if 2 modes are overriding the same class... then deactivate one of the 2 mods and beg on your knees the Mod owners to find another way to accomplish the same goal by using ScreenListeners instead of ClassOverrieds (which is super easy if possible and it is possible 75% of the times...)

I hope this helps a lot of people. I was initially convinced that my Mac was slow and was almost on the verge to purchase a new one... untill I realized this (while programmy my own Mods as a fun exercise to refresh/increase my programming skills...)