Using compressor as group on vocals

I have Intel celeron CPU 900 @ 2.20GHz with 4gig RAM laptop that i use for production.but currently am having problem with my CPU usage dew to my work space.i use nectar 2 as insert on every of my vocals e.g 5 vocals means i have to insert complete nectar 2 5 times and this slowly cripple my CPU usage and even freezes my laptop.Now i just learnt grouping to make my work space flexible and cheap but i am worried if my nectar 2 plugins will work on grouping accurately without having to use it as insert on my signals separately ?.in other words,if i route 5 vocals to a group.will 1 compression work effectively for all the 5 vocals routed effectively ? .if not must i use it on every insert separately ? .
 
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