1. Narrow down the sweep freq also reduce the sweep point.
2. combine small element into one big element
3. One more suggestion but need to be careful is that if your antenna array is a patch design facing z direction for example, you can try to reduce the radiation box at x and y direction. I tried it the 2D / 3D result is almost the same as long as I keep the z direction as lamda/4. However the efficiency might not accurate. I use this method to shorten my wait time when I am tuning the dimension. Once I finalize the design I will increase the radiation box back to x,y,z > lamda/4 to see the final result.