Lag issues with Unit Groups

Well in my new map, theres lag half way in cause of all the unit groups being created. I was wondering, how do you get rid of this??

I know theres that JASS function that allows you to destroy "last created Unit Group", does anyone know it?

But this before you pick each unit group:

so this will destroy the group as soon as the function after it carries out its duties?

Basically it destroys the temp group at the end of the function.

Dont put that in front of any unit groups that are a unit group global variable..

IE


PlayerOneKnights is a unit group gloval variable.