In this particulary part, actually i dont need to save resources.

But I have other larger parts with multiple fillets to which I need to run design analysis and because a dont have a powerfull pc right now, the solver take too long.

even with some fillets and a bigger model, if you've simplified yoru assembly properly and are doing a straight static analysis, it should still solve quickly on a simple computer. but for this torque problem, there is no real way to simplify it using symmetry.

you can't use symmetry for this problem