I doubt they're no performers, they're likely selective performers. Issues like this can often be explained by Public Goods Game theory. If there's no economic incentive, then some participants will choose to not contribute or under-contribute.
Well, there is an economic incentive - "salary". If you're not interested in it, may be it's time to move on as time is your own most valuable asset and choosing to waste it on "free ride" - it's something beyond my comprehension: you're literally waiting to be exposed and fired.
https://en.m.wikipedia.org/wiki/Public_goods_game