There was no consideration of performance at all. The raises you get are laid out in the collective bargaining agreement contract for every non-management person in the company and completely transparent. I suspect a grocery store union would be extremely similar. Mine was Teamsters so not small also mine was from 2004-2012. There were other jobs in the company with higher rises and higher pay like driving and delivering packages or driving a semi truck. These kinds of higher paying positions are going to be limited in number at a grocery store.