OS is win10, RAM is 8Go, proc is 3.2GHz (I don't know the year :s )
Weird, that should be fine for running the launcher.
Does it lag when you try to use a buff with the formation full, or even with the formation empty?
Are you trying to use the buffs while sprinting or while idling on an area?
Is it all buffs or just the Time Warps?