Hello Sambit,
I think simulation time has nothing to do with the relative permittivity of the material. Also, please note that Floquet is the excitation type and not a boundary condition.
Can you please let us know which stage of the simulation takes too long? Please check RAM and processor occupancy while running the simulation.
Can you please share information (preferably screenshots) regarding mesh settings, convergence and simulation profile?
Best regards
Anchal
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