Correct, the union does not recognize any performance standards. However, getting the (driving) job is done by demonstrating you can meet very high performance

Correct, the union does not recognize any performance standards. However, getting the (driving) job is done by demonstrating you can meet very high performance standards over the course of 30 days, and other things like even minor dishonesty can result in being fired on the spot. There's also lots of gentler pressure than "work faster or we'll fire you" that happens in practice, with a lot of contract language that can work both ways.