Number of polygone for mobs ?

Hello so I would like to know how many polygone could be set by mobs ? In my game , I would like to put a lot of mobs ( around 15 per group ) so I want to know how much polygone must have my mobs 3d model ? Actually , the mobs has 5000 , so I’m thinking about the optimisation to don’t decrease fps.

It depends… 5k isok unless you have 30+ mobs on screen at once.
Also watch out material complexity, lights and shadows and translucency.