Coplanar waveguide in CST

Hi
I have simulated coplanar waveguide in CST, however since the software is licensed to 100,000 meshes.When I solve it using transient solver the simulation stops saying to reduce no of mesh size. I have noidea how to reduce the no of mesh . I have tried several options like reducing frequency sweep range. also several other suggested by CST help. can anyone help.

Thanks

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