The Chicago-based investor who has pledged to spend up to $200 million on a Brockton casino says he may walk away from the deal unless the state Gaming Commission takes swift action on his proposal.

“I’ve got other things to do,” said Neil Bluhm, who along with local partner George Carney is proposing a sprawling casino and hotel complex on the Brockton fairgrounds near Route 123. “Do I want to be here? Yes. I’m not giving an ultimatum, but I’m not going to sit here waiting forever.”