Help: simulation problems about passive Mixer

I intend to simulate a passive Mixer, when i run the voltage conversion gain, the pss simulation ran very slow or even stopped after several point, who can tell me how to setup the simlation to make it correct, does it the matter of converge?
Thanks a lot

Try to reduce the LO input level.
Also if the RF input level is too high and the mixer get into compression the simulator can have problems to converge