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Why there is so high computational cost of multiplication in Microsoft Seal?

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I was doing some Microsoft Seal testing on my macbook pro (i7) and got following results

Coefficient mod $q = 100$ bits and Polynomial degree $n= 8192$

  • Ciphertext-Plaintext multiplication takes 0.211 milliseconds
  • Ciphertext-Ciphertext multiplication takes 24 milliseconds, when I pick 5 RNS moduli for coefficient mod.
  • It takes 9 milliseconds when I pick 2 RNS moduli for coefficient mod.

I want to understand why Ciphertext-Ciphertext is so much more expensive than Ciphertext-Plaintext, I was expecting only 4-10 more expensive due to tensor multiplication?

Note above results are without relinearization.

mangohost

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