@grinch2901 : The program displays the number of springs at the bottom of the interface each time you open the Simulation tab. On your 8 threads computer, a simulation must go fast enough if you have less than 10 millions springs. If you use the self-collision, which needs many computations, you have to remove, from the self-collision, all the parts of your cloth which are not concerned by it. This will accelerate the simulation.

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