Question: how to improve simulation efficitioncy with kinematic loop mechanical model?

Current I need model a mechanical system with kinematic loop. In Maplesim4 the calculation speed is too slow. I need to use this model in HILS. How to solve this problem? I check the 'four bar' example, It's too slow(simulation 1 second, 40second is needed, Intel xeon 3GHz,2cpu) Anyone who can help me? Thanks! Wander
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