Based on Mephansteras mod, I applied the standardized creatures as done by Meph on his Accelerated Mod.

Should give better fps, has the downfall of reducing leather prices, but... that could be fixed by just changing leather to local_creature_mat:leather vs creature_mat:animal:leather

Note:
the reduced amounts of leather and chitin don't affect the game's defensive values for said items. Vigorously tested using dfhack and masterwork's arena