CST报错the current settings will probably lead to a very long simulation time

各位好，我用CST模拟SRR环，units设定为mm，GHz，ns，单元大小为5*5*2.5。 the current settings will probably lead to a very long simulation time you may improve the simulation speed by: 1. checking the frequency range and units settings 2. extending the simulation frequency range 3. checking the mesh to avoid very small mesh steps error during construction of pre-conditioner. Not enough memory 频率设定是0-15 我的网格划分的已经很小了，每个波长才三个网格， 一共这个元件才1196个格，怎么还算不了呢？同样的尺寸，把unit设定为um，THz，ps就能算了，只是算的特别快，快的不正常。
那位知道可能由于什么原因呀？谢谢先

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