Hi,
It depends on your freq of interest.
You can reduce the no of triangles. You can set the size of the triangles that you want under Mesh Size, but the limitation is something like lamda/4. So it is determined by your freq of interest.
But if you do increase your triangle size, it would affect the model as it would not as accurate.
FEKO LITE is really limited, and it only allows you to try simple geometries.
Even if you do get by this, there is a restriction to the amount of memory that you can use to solve the problem. If i did not remember wrongly, the limit is like 30 MB of memory.
Regards.
Regards.