Instead of using Maya cloth try it this way, works for me and less rendering time. Create a nurbs plane for your flag, turn it into a soft body object and add a turbulence field. Adjust the goal weight attribute to give wind 'strength' effect. Lastly you need to give the flag a direction to 'blow'. So you need to create an expression (coz it's easier) go to the phase X attribute of the turbulence field, right click on it and enter -
SimplyMaya specialises in Maya tutorials. We offer over 1,000 individual Maya training videos, ranging from basic Maya tutorials through to intermediate Maya tutorials. Our tutorials are created by instructors with industry experience and are designed to get you up and running in Maya quickly without making it seem like hard work.